caubert / CSCI_3410 (public) (License: CC BY 4.0) (since 2018-05-16) (hash sha1)
Material for Database Class.
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List of commits:
Subject Hash Author Date (UTC)
worked on solution to first exam. b13ad99dd895f124df1b642fd990071fc09db294 aubert@math.cnrs.fr 2020-09-23 17:44:01
Added solution to first problem. 0948cee47ed78dc115fd69c7bcf96a312dd3162f aubert@math.cnrs.fr 2020-09-18 21:43:00
Added solution to problem 2 of Exam #1. 7ad20b3c0025a4de3fa00729de570c6fe9176773 aubert@math.cnrs.fr 2020-09-18 21:34:19
Added solution to project 1. de427d78745593ab53dc70e7129b67fee1d4489c aubert@math.cnrs.fr 2020-09-10 19:04:45
Added example for MAX and NULL values. b82a496a5ffbcecaf2c5851f18d1b08ce8732623 aubert@math.cnrs.fr 2020-09-10 13:14:13
Changed SQL code formatting. 6c3cad5a2545f46ab113f7df7a83457857d82ed8 aubert@math.cnrs.fr 2020-09-09 17:04:55
Cleaned code. 5bdb4faed3a83b81257734f1e1aced2890783f04 aubert@math.cnrs.fr 2020-09-03 21:35:41
Added the first project. 564a02887933f2395bc40d7d8a10833f657659fd aubert@math.cnrs.fr 2020-08-28 22:34:08
Week 2 edits, added quiz #1, couple of fixes, replaced single quote with double quotes. 3c9942731678900122088356db3a2cbabd99b9be aubert@math.cnrs.fr 2020-08-27 19:00:13
Added ressource for makefile. 7696c44bca707646530a7dbb71bf2e05badaa306 aubert@math.cnrs.fr 2020-08-03 16:00:23
Crystal's final edits. 714e3030423a836c4ba07890f9aa5e45f58ad15a aubert@math.cnrs.fr 2020-05-21 17:43:26
Converted an image into a figure (Movie example). c55e61ed5d11631e908d99b14ef10a0a0247bda0 aubert@math.cnrs.fr 2020-05-20 20:58:41
Re-formatted SQL code. 915442a1ba4d8baa120343f98de5ee39d4ac45f6 aubert@math.cnrs.fr 2020-05-18 15:52:06
Fixed Known_bugs 5900c572928ec3b8c98c82fe4e95ebbe9aeee6c3 aubert@math.cnrs.fr 2020-05-15 18:19:36
Fixed contrib and enriched example. 04864c0ee2d4fa77b4e681ebf8049c4642bf1e67 aubert@math.cnrs.fr 2020-05-15 18:17:22
Fixed formatting mistake. 948a87c75b5d9aa8317feb5a0859d4efc23e95d6 aubert@math.cnrs.fr 2020-05-15 17:58:40
Cleaned SQL code. 4d39ebc5c1a3566ef4d3fa7afc8b2868f827c108 aubert@math.cnrs.fr 2020-05-15 17:41:00
Fixing few mistakes in code. b7eb7a0e476f8e0c3c6d3e651fd80827a03dd127 aubert@math.cnrs.fr 2020-05-15 17:38:32
Fixing few mistakes in code. 2bc77d7ee4e82e6961ce123fb7c3e1c68cba59b5 aubert@math.cnrs.fr 2020-05-15 17:30:02
Testing and indenting SQL code. a2b3bb4e242dd4980b94b25d11d6001459e2f0a0 aubert@math.cnrs.fr 2020-05-15 17:26:27
Commit b13ad99dd895f124df1b642fd990071fc09db294 - worked on solution to first exam.
Author: aubert@math.cnrs.fr
Author date (UTC): 2020-09-23 17:44
Committer name: aubert@math.cnrs.fr
Committer date (UTC): 2020-09-23 17:44
Parent(s): 0948cee47ed78dc115fd69c7bcf96a312dd3162f
Signer:
Signing key:
Signing status: N
Tree: 701a3607bd580e6ff74e61c335fa8902c95fbe93
File Lines added Lines deleted
notes/code/sql/HW_AdvancedFK.sql 14 13
notes/code/sql/HW_Capstone.sql 2 3
notes/code/sql/HW_CapstoneSol.sql 38 36
notes/code/sql/HW_Certificate.sql 27 27
notes/code/sql/HW_ConstraintsPart1.sql 1 1
notes/code/sql/HW_DBCoffee.sql 12 12
notes/code/sql/HW_Department.sql 1 1
notes/code/sql/HW_Faculty.sql 1 1
notes/code/sql/HW_ProcedureExamples.sql 3 3
notes/code/sql/HW_ProfExample.sql 2 2
notes/code/sql/HW_ResidencySol.sql 25 25
notes/code/sql/HW_ScientificResearch.sql 80 98
notes/code/sql/HW_ScientificResearchSol.sql 223 0
notes/code/sql/HW_SocialMedia.sql 9 9
notes/code/sql/HW_Storm.sql 23 22
notes/code/sql/HW_TextbookAuthoredSol.sql 0 5
notes/code/sql/HW_TriggerExample.sql 10 10
notes/code/sql/HW_Work.sql 27 26
notes/lectures_notes.md 75 2
File notes/code/sql/HW_AdvancedFK.sql changed (mode: 100644) (index 8a12e14..ec81722)
... ... CREATE TABLE T2 (
19 19 B1 INT PRIMARY KEY, B1 INT PRIMARY KEY,
20 20 B2 INT, B2 INT,
21 21 -- We can create a "pair" of foreign key in one line, as -- We can create a "pair" of foreign key in one line, as
22 -- follows:
22 -- follows:
23 23 FOREIGN KEY (A1, A2) REFERENCES T1 (A1, A2), FOREIGN KEY (A1, A2) REFERENCES T1 (A1, A2),
24 24 -- We can create a foreign key that references the primary -- We can create a foreign key that references the primary
25 -- key of the table we are currently creating, and name
26 -- it,
27 -- as follows:
25 -- key of the table we are currently creating, and name
26 -- it,
27 -- as follows:
28 28 CONSTRAINT My_pk_to_T1 FOREIGN KEY (B2) REFERENCES T2 (B1) CONSTRAINT My_pk_to_T1 FOREIGN KEY (B2) REFERENCES T2 (B1)
29 29 ); );
30 30
31 31 -- The benefit of naming our fk constraint is that, if we -- The benefit of naming our fk constraint is that, if we
32 -- violate it, for instance with
33 -- INSERT INTO T2 VALUES (1, 1, 1, 3);
34 -- then the name of the constraint (here
35 -- "My_pk_to_T1")
36 -- would be displayed in the error message:
37 -- Cannot add or update a child row: a foreign key
38 -- constraint fails (`db_9_9837c1`.`t2`, CONSTRAINT
39 -- `My_pk_to_T1` FOREIGN KEY (`B2`) REFERENCES `t2`
40 -- (`B1`))
41 -- end snippet advancedFK
File notes/code/sql/HW_Capstone.sql changed (mode: 100644) (index ba0282a..062b8b8)
1 1 /* code/sql/HW_Capstone.sql */ /* code/sql/HW_Capstone.sql */
2
3 2 DROP SCHEMA IF EXISTS HW_CAPSTONE; DROP SCHEMA IF EXISTS HW_CAPSTONE;
4 3
5 4 CREATE SCHEMA HW_CAPSTONE; CREATE SCHEMA HW_CAPSTONE;
 
... ... VALUES (
75 74 "PSF"); "PSF");
76 75
77 76 -- Taken from -- Taken from
77 --
78 78 -- https://en.wikipedia.org/wiki/Comparison_of_open-source_pr -- https://en.wikipedia.org/wiki/Comparison_of_open-source_pr
79
79 -- ogramming_language_licensing
80 80 INSERT INTO PROJECT INSERT INTO PROJECT
81 81 VALUES ( VALUES (
82 82 "Brick Break", "Brick Break",
File notes/code/sql/HW_CapstoneSol.sql changed (mode: 100644) (index 90524f2..0139319)
... ... VALUES (
79 79 -- --
80 80 -- --
81 81 -- --
82 --
82 83 -- https://en.wikipedia.org/wiki/Comparison_of_open-source_pr -- https://en.wikipedia.org/wiki/Comparison_of_open-source_pr
84 -- ogramming_language_licensing
83 85 INSERT INTO PROJECT INSERT INTO PROJECT
84 86 VALUES ( VALUES (
85 87 "Brick Break", "Brick Break",
 
... ... VALUES (
117 118 /* /*
118 119 * You can start editing starting here. * You can start editing starting here.
119 120 */ */
120
121 121 -- start snippet solution -- start snippet solution
122 122 /* /*
123 123 code/sql/HW_CapstoneSol.sql code/sql/HW_CapstoneSol.sql
124 124 */ */
125
126 125 /* /*
127 126
128 127 I. Short Questions (6 pts) I. Short Questions (6 pts)
 
... ... Answer the following short questions based on the model implemented above.
131 130 You can simply answer "True" or "False", or justify your reasoning (e.g. with code). You can simply answer "True" or "False", or justify your reasoning (e.g. with code).
132 131 */ */
133 132 -- 1. Can a project uses multiple programming languages? -- 1. Can a project uses multiple programming languages?
133 -- Yes.
134 -- 2. Can a student be the leader of multiple
135 -- projects?
136 -- Yes.
137 -- 3. Can multiple projects have the same code name?
138 -- Yes.
139 -- 4. Could Claude simply enter NULL for the value of
140 -- his
141 -- project's code name, since he's undecided?
142 -- No.
143 -- 5. Can a project be created without project leader?
144 -- No.
145 -- 6. Can we know who is working on a project without
146 -- being
147 -- its leader?
148 -- No.
134 149 /* /*
135 150
136 151 II. Relational Model (6 pts.) II. Relational Model (6 pts.)
 
... ... Please, leave them uncommented, unless you can't write them correctly, in which
162 162 The first question is answered as an example. The first question is answered as an example.
163 163 */ */
164 164 -- 0. Write a command that list all the names of the -- 0. Write a command that list all the names of the
165 -- programming languages.
165 166 SELECT Name SELECT Name
166 167 FROM PROGRAMMING_LANGUAGE; FROM PROGRAMMING_LANGUAGE;
167 168
168 169 -- 1. Write a command that insert a new student in the -- 1. Write a command that insert a new student in the
170 -- STUDENT table.
171 -- (You should invent the values).
169 172 INSERT INTO STUDENT INSERT INTO STUDENT
170 173 VALUES ( VALUES (
171 174 "Bob", "Bob",
 
... ... VALUES (
177 177 NULL); NULL);
178 178
179 179 -- 2. Write a command that updates the code name of the -- 2. Write a command that updates the code name of the
180 -- project ("Undecided", "9999999999999") to "VR in
181 -- ER".
180 182 UPDATE UPDATE
181 183 PROJECT PROJECT
182 184 SET CodeName = "VR in ER" SET CodeName = "VR in ER"
 
... ... WHERE CodeName = "Undecided"
185 186 AND Leader = "9999999999999"; AND Leader = "9999999999999";
186 187
187 188 -- 3. Write a command that updates the graduation year of the -- 3. Write a command that updates the graduation year of the
189 -- student whose id is "0987654321098" to 2024, and the
190 -- semester to "Fall".
188 191 UPDATE UPDATE
189 192 STUDENT STUDENT
190 193 SET GraduationYear = 2024, SET GraduationYear = 2024,
 
... ... SET GraduationYear = 2024,
194 195 WHERE id = "0987654321098"; WHERE id = "0987654321098";
195 196
196 197 -- 4. Write a command that changes the STUDENT table to make -- 4. Write a command that changes the STUDENT table to make
198 -- it impossible to enter NULL for the first name of a
199 -- student, without changing the primary key.
197 200 ALTER TABLE STUDENT MODIFY FName VARCHAR(50) NOT NULL; ALTER TABLE STUDENT MODIFY FName VARCHAR(50) NOT NULL;
198 201
199 202 -- 5. Write a command that changes the datatype of -- 5. Write a command that changes the datatype of
203 -- GraduationYear to SMALLINT.
200 204 ALTER TABLE STUDENT MODIFY GraduationYear SMALLINT; ALTER TABLE STUDENT MODIFY GraduationYear SMALLINT;
201 205
202 206 -- 6. Write a command that adds an attribute "ReleaseDate" to -- 6. Write a command that adds an attribute "ReleaseDate" to
207 -- the PROJECT table.
203 208 ALTER TABLE PROJECT ALTER TABLE PROJECT
204 209 ADD COLUMN ReleaseDate DATE; ADD COLUMN ReleaseDate DATE;
205 210
206 211 -- 6.bis If you managed to write the previous command -- 6.bis If you managed to write the previous command
212 -- correctly, write a command that sets the release
213 -- date
214 -- of
215 -- the project ("Brick Break", "0123456789100") to the
216 -- 26th
217 -- of November 2022.
207 218 UPDATE UPDATE
208 219 PROJECT PROJECT
209 220 SET ReleaseDate = DATE "20221126" SET ReleaseDate = DATE "20221126"
 
... ... WHERE CodeName = "Brick Break"
220 222 AND Leader = "0123456789100"; AND Leader = "0123456789100";
221 223
222 224 -- 7. Write a command that makes it impossible for a student -- 7. Write a command that makes it impossible for a student
225 -- to be the leader in more than one project
226 -- (This command should return an error)
227 -- ALTER TABLE PROJECT ADD UNIQUE (Leader);
File notes/code/sql/HW_Certificate.sql changed (mode: 100644) (index 2cd79b9..03e33ff)
... ... SELECT CN
91 91 FROM CERTIFICATE; FROM CERTIFICATE;
92 92
93 93 -- (*.wikimedia.org | *.fsf.org | *.shadytest.org | -- (*.wikimedia.org | *.fsf.org | *.shadytest.org |
94 -- *.wikipedia.org)
95 -- The SN of the organizations whose CN contains
96 -- "Foundation"
94 -- *.wikipedia.org)
95 -- The SN of the organizations whose CN contains
96 -- "Foundation"
97 97 SELECT SN SELECT SN
98 98 FROM ORGANIZATION FROM ORGANIZATION
99 99 WHERE CN LIKE "%Foundation%"; WHERE CN LIKE "%Foundation%";
100 100
101 101 -- (01 | 02) -- (01 | 02)
102 -- The CN and expiration date of all the
103 -- expired (assuming we are the 6th of December
102 -- The CN and expiration date of all the
103 -- certificates
104 -- that
105 -- expired (assuming we are the 6th of December
106 -- 2019).
104 107 SELECT CN, SELECT CN,
105 108 Valid_Until Valid_Until
106 109 FROM CERTIFICATE FROM CERTIFICATE
107 110 WHERE Valid_Until < DATE '20191206'; WHERE Valid_Until < DATE '20191206';
108 111
109 112 -- (*.fsf.org, 2019-10-10) -- (*.fsf.org, 2019-10-10)
110 -- The CN of the CA that are not trusted.
113 -- The CN of the CA that are not trusted.
111 114 SELECT CN SELECT CN
112 115 FROM CA FROM CA
113 116 WHERE Trusted IS NOT TRUE; WHERE Trusted IS NOT TRUE;
114 117
115 118 -- (Shady Corp. | NewComer Ltd.) -- (Shady Corp. | NewComer Ltd.)
116 -- The CN of the certificates that are signed by a
117 -- is not trusted.
119 -- The CN of the certificates that are signed by a
120 -- CA
121 -- that
122 -- is not trusted.
118 123 SELECT CERTIFICATE.CN SELECT CERTIFICATE.CN
119 124 FROM CERTIFICATE, FROM CERTIFICATE,
120 125 CA CA
 
... ... WHERE Trusted IS NOT TRUE
127 127 AND CA.SN = CERTIFICATE.Issuer; AND CA.SN = CERTIFICATE.Issuer;
128 128
129 129 -- (Shady Corp. | NewComer Ltd.) -- (Shady Corp. | NewComer Ltd.)
130 -- The number of certificates signed by the CA
131 -- "Let's encrypt".
130 -- The number of certificates signed by the CA
131 -- whose
132 -- CN
133 -- is
134 -- "Let's encrypt".
132 135 SELECT COUNT(CERTIFICATE.SN) AS "Number of certificates signed SELECT COUNT(CERTIFICATE.SN) AS "Number of certificates signed
133 136 by Let's encrypt" by Let's encrypt"
134 137 FROM CERTIFICATE, FROM CERTIFICATE,
 
... ... WHERE CERTIFICATE.Issuer = CA.SN
140 140 AND CA.CN = "Let's encrypt"; AND CA.CN = "Let's encrypt";
141 141
142 142 -- (2) -- (2)
143 -- A table listing the CN of the organizations
144 -- the CN of their certificates.
143 -- A table listing the CN of the organizations
144 -- along
145 -- with
146 -- the CN of their certificates.
145 147 SELECT ORGANIZATION.CN AS Organization, SELECT ORGANIZATION.CN AS Organization,
146 148 CERTIFICATE.CN AS Certificate CERTIFICATE.CN AS Certificate
147 149 FROM ORGANIZATION, FROM ORGANIZATION,
 
... ... FROM ORGANIZATION,
151 151 WHERE CERTIFICATE.Org = ORGANIZATION.SN; WHERE CERTIFICATE.Org = ORGANIZATION.SN;
152 152
153 153 -- ( Wikimedia Foundation, *.wikimedia.org | Free Software -- ( Wikimedia Foundation, *.wikimedia.org | Free Software
154 -- Foundation, *.fsf.org | Free Software Foundation
155 -- *.shadytest.org | Wikimedia Foundation ,
156 -- )
154 -- Foundation, *.fsf.org | Free Software Foundation
155 -- ,
156 -- *.shadytest.org | Wikimedia Foundation ,
157 -- *.wikipedia.org
158 -- )
157 159 /* /*
158 160 DELETE FROM CA WHERE SN = 'A'; DELETE FROM CA WHERE SN = 'A';
159 161 ERROR 1451 (23000): Cannot delete or update a parent row: a foreign key constraint fails (`HW_Certificate`.`CERTIFICATE`, CONSTRAINT `CERTIFICATE_ibfk_2` FOREIGN KEY (`Issuer`) REFERENCES `CA` (`SN`)) ERROR 1451 (23000): Cannot delete or update a parent row: a foreign key constraint fails (`HW_Certificate`.`CERTIFICATE`, CONSTRAINT `CERTIFICATE_ibfk_2` FOREIGN KEY (`Issuer`) REFERENCES `CA` (`SN`))
File notes/code/sql/HW_ConstraintsPart1.sql changed (mode: 100644) (index 68cea1d..0f5cc26)
... ... CREATE TABLE HURRICANE (
10 10 WindSpeed INT DEFAULT 76 CHECK (WindSpeed > 74 AND WindSpeed INT DEFAULT 76 CHECK (WindSpeed > 74 AND
11 11 WindSpeed < 500), WindSpeed < 500),
12 12 -- 75mph is the minimum to be considered as a hurricane -- 75mph is the minimum to be considered as a hurricane
13 -- cf. https://www.hwn.org/resources/bws.html
13 -- cf. https://www.hwn.org/resources/bws.html
14 14 Above VARCHAR(25) Above VARCHAR(25)
15 15 ); );
16 16
File notes/code/sql/HW_DBCoffee.sql changed (mode: 100644) (index 147d39a..3c543c1)
... ... VALUES (
125 125 3.00); 3.00);
126 126
127 127 -- The following statement raises an error. -- The following statement raises an error.
128 -- INSERT INTO PROVIDER
129 -- VALUES (NULL, "contact@localcof.com");
130 -- ERROR 1048 (23000) at line 68: Column 'Name'
131 -- null
128 -- INSERT INTO PROVIDER
129 -- VALUES (NULL, "contact@localcof.com");
130 -- ERROR 1048 (23000) at line 68: Column 'Name'
131 -- cannot
132 -- be
133 -- null
132 134 INSERT INTO SUPPLY INSERT INTO SUPPLY
133 135 VALUES ( VALUES (
134 136 "Johns & Co.", "Johns & Co.",
135 137 121); 121);
136 138
137 139 -- The following statement raises an error. -- The following statement raises an error.
138 -- -INSERT INTO SUPPLY
139 -- VALUES ("Coffee Unl.", 311, 221);
140 -- ERROR 1136 (21S01): Column count doesn't match
141 -- count at row 1
142 -- Rest the changes:
140 -- -INSERT INTO SUPPLY
141 -- VALUES ("Coffee Unl.", 311, 221);
142 -- ERROR 1136 (21S01): Column count doesn't match
143 -- value
144 -- count at row 1
145 -- Rest the changes:
143 146 ROLLBACK; ROLLBACK;
144 147
145 148 -- Question 3: -- Question 3:
File notes/code/sql/HW_Department.sql changed (mode: 100644) (index d004b66..4d17f1f)
5 5 DROP SCHEMA IF EXISTS HW_Department; DROP SCHEMA IF EXISTS HW_Department;
6 6
7 7 -- Carefull, we are dropping the schema HW_Department if it -- Carefull, we are dropping the schema HW_Department if it
8 -- exists already, and all the data in it.
8 -- exists already, and all the data in it.
9 9 CREATE SCHEMA HW_Department; CREATE SCHEMA HW_Department;
10 10
11 11 -- And then re-creating it. -- And then re-creating it.
File notes/code/sql/HW_Faculty.sql changed (mode: 100644) (index 8fd04eb..16a8c1b)
... ... VALUES (
68 68 '19940101', -- Or '940101', '1994-01-01', '94/01/01' '19940101', -- Or '940101', '1994-01-01', '94/01/01'
69 69 '090500', -- Or '09:05:00', '9:05:0', '9:5:0', '090500' '090500', -- Or '09:05:00', '9:05:0', '9:5:0', '090500'
70 70 -- Note also the existence of DATETIME, with 'YYYY-MM-DD -- Note also the existence of DATETIME, with 'YYYY-MM-DD
71 -- HH:MM:SS'
71 -- HH:MM:SS'
72 72 'Apple' -- This is not case-sensitive, oddly enough. 'Apple' -- This is not case-sensitive, oddly enough.
73 73 ); );
File notes/code/sql/HW_ProcedureExamples.sql changed (mode: 100644) (index 95c4c9e..0a93dae)
... ... BEGIN
42 42 END; END;
43 43 $$ $$
44 44 -- This is the delimiter that marks the end of the procedure -- This is the delimiter that marks the end of the procedure
45 -- definition.
45 -- definition.
46 46 DELIMITER ; DELIMITER ;
47 47
48 48 -- Now, we want ";" to be the "natural" delimiter again. -- Now, we want ";" to be the "natural" delimiter again.
 
... ... DELIMITER ;
69 69 SHOW CREATE PROCEDURE STUDENTLOGIN; SHOW CREATE PROCEDURE STUDENTLOGIN;
70 70
71 71 -- This display information about the procedure just created. -- This display information about the procedure just created.
72 -- We can pass quite naturally an argument to our
73 -- procedure.
72 -- We can pass quite naturally an argument to our
73 -- procedure.
74 74 CALL STUDENTLOGIN ("Test A"); CALL STUDENTLOGIN ("Test A");
75 75
76 76 -- end snippet procedure-3 -- end snippet procedure-3
File notes/code/sql/HW_ProfExample.sql changed (mode: 100644) (index b9c0af7..aa42573)
... ... WHERE DEPARTMENT.Name = "Mathematics"
215 215 AND Department = Code; AND Department = Code;
216 216
217 217 -- end snippet select-project-join-1 -- end snippet select-project-join-1
218 -- start snippet select-project-join-2
218 -- start snippet select-project-join-2
219 219 SELECT Name SELECT Name
220 220 FROM STUDENT, FROM STUDENT,
221 221 GRADE GRADE
 
... ... WHERE Grade > 3.0
223 223 AND STUDENT.Login = GRADE.Login; AND STUDENT.Login = GRADE.Login;
224 224
225 225 -- end snippet select-project-join-2 -- end snippet select-project-join-2
226 -- start snippet select-project-join-3
226 -- start snippet select-project-join-3
227 227 SELECT PROF.Name SELECT PROF.Name
228 228 FROM PROF, FROM PROF,
229 229 DEPARTMENT, DEPARTMENT,
File notes/code/sql/HW_ResidencySol.sql changed (mode: 100644) (index 2c94f53..c31ab37)
... ... VALUES (
75 75 the next question. the next question.
76 76 */ */
77 77 -- Exercise 4 -- Exercise 4
78 -- List the rows (i.e., P.2, H.1, or even
79 -- modified by the following statements:
78 -- List the rows (i.e., P.2, H.1, or even
79 -- “none”)
80 -- modified by the following statements:
80 81 START TRANSACTION; START TRANSACTION;
81 82
82 83 UPDATE UPDATE
 
... ... ROLLBACK;
106 106 START TRANSACTION; START TRANSACTION;
107 107
108 108 -- Commented, because it causes an error. -- Commented, because it causes an error.
109 -- DELETE FROM PERSON
110 -- WHERE Birthdate = DATE "1990-02-11";
111 -- None, because of the foreign key and the
112 -- integrity constraint.
113 -- ERROR 1451 (23000): Cannot delete or update a
114 -- row:
115 -- a foreign key constraint fails
116 -- (`HW_RESIDENCY_SOL`.`RESIDENCY`, CONSTRAINT
117 -- `RESIDENCY_ibfk_1` FOREIGN KEY (`Person`)
118 -- `PERSON` (`SSN`))
109 -- DELETE FROM PERSON
110 -- WHERE Birthdate = DATE "1990-02-11";
111 -- None, because of the foreign key and the
112 -- referential
113 -- integrity constraint.
114 -- ERROR 1451 (23000): Cannot delete or update a
115 -- parent
116 -- row:
117 -- a foreign key constraint fails
118 -- (`HW_RESIDENCY_SOL`.`RESIDENCY`, CONSTRAINT
119 -- `RESIDENCY_ibfk_1` FOREIGN KEY (`Person`)
120 -- REFERENCES
121 -- `PERSON` (`SSN`))
119 122 ROLLBACK; ROLLBACK;
120 123
121 124 -- end snippet solution4 -- end snippet solution4
 
... ... SELECT Address
131 131 FROM HOUSE; FROM HOUSE;
132 132
133 133 -- … the SSN of the persons whose first name was not -- … the SSN of the persons whose first name was not
134 -- entered in the system (000-00-0000).
134 -- entered in the system (000-00-0000).
135 135 SELECT SSN SELECT SSN
136 136 FROM PERSON FROM PERSON
137 137 WHERE FName IS NULL; WHERE FName IS NULL;
 
... ... SELECT DISTINCT COLOR
141 141 FROM HOUSE; FROM HOUSE;
142 142
143 143 -- … the address of the residency of James Baldwin (123 -- … the address of the residency of James Baldwin (123
144 -- Main St.).
144 -- Main St.).
145 145 SELECT House SELECT House
146 146 FROM RESIDENCY, FROM RESIDENCY,
147 147 PERSON PERSON
 
... ... WHERE PERSON.Fname = "James"
150 150 AND PERSON.SSN = RESIDENCY.Person; AND PERSON.SSN = RESIDENCY.Person;
151 151
152 152 -- … the first name of the oldest person in the database -- … the first name of the oldest person in the database
153 -- (James).
153 -- (James).
154 154 SELECT FName SELECT FName
155 155 FROM PERSON FROM PERSON
156 156 WHERE Birthdate = ( WHERE Birthdate = (
 
... ... WHERE Birthdate = (
159 159 WHERE Birthdate IS NOT NULL); WHERE Birthdate IS NOT NULL);
160 160
161 161 -- … Michael Keal’s principal residency address (123 Main -- … Michael Keal’s principal residency address (123 Main
162 -- St.).
162 -- St.).
163 163 SELECT RESIDENCY.House SELECT RESIDENCY.House
164 164 FROM RESIDENCY, FROM RESIDENCY,
165 165 PERSON PERSON
 
... ... WHERE PERSON.FName = "Michael"
169 169 AND RESIDENCY.PrincipalResidence = TRUE; AND RESIDENCY.PrincipalResidence = TRUE;
170 170
171 171 -- … the (distinct) first and last names of the homeowners -- … the (distinct) first and last names of the homeowners
172 -- (Michael Keal, Mridula Warrier).
172 -- (Michael Keal, Mridula Warrier).
173 173 SELECT DISTINCT (PERSON.FName), SELECT DISTINCT (PERSON.FName),
174 174 PERSON.LName PERSON.LName
175 175 FROM PERSON, FROM PERSON,
 
... ... WHERE SSN IN ( SELECT DISTINCT (RESIDENCY.Person)
186 186 WHERE RESIDENCY.Status = "own"); WHERE RESIDENCY.Status = "own");
187 187
188 188 -- … the SSN of the persons that have the same principal -- … the SSN of the persons that have the same principal
189 -- residency as James Baldwin (000-00-0001).
189 -- residency as James Baldwin (000-00-0001).
190 190 SELECT RoomMate.Person SELECT RoomMate.Person
191 191 FROM RESIDENCY AS James, FROM RESIDENCY AS James,
192 192 RESIDENCY AS RoomMate, RESIDENCY AS RoomMate,
 
... ... WHERE PERSON.FName = "James"
202 202 START TRANSACTION; START TRANSACTION;
203 203
204 204 -- start snippet homonyms -- start snippet homonyms
205 -- If we have homonymns in our database, e.g.
205 -- If we have homonymns in our database, e.g.
206 206 INSERT INTO PERSON INSERT INTO PERSON
207 207 VALUES ( VALUES (
208 208 "A", "A",
 
... ... VALUES (
234 234 "own"); "own");
235 235
236 236 -- Then the query below fails, in the sense that it reports -- Then the query below fails, in the sense that it reports
237 -- the name "A, B" only once.
237 -- the name "A, B" only once.
238 238 SELECT DISTINCT (PERSON.FName), SELECT DISTINCT (PERSON.FName),
239 239 PERSON.LName PERSON.LName
240 240 FROM PERSON, FROM PERSON,
 
... ... WHERE RESIDENCY.Status = "own"
243 243 AND RESIDENCY.Person = PERSON.SSN; AND RESIDENCY.Person = PERSON.SSN;
244 244
245 245 -- A better (and not much more complicated) solution would -- A better (and not much more complicated) solution would
246 -- have been
246 -- have been
247 247 SELECT PERSON.FName, SELECT PERSON.FName,
248 248 PERSON.LName PERSON.LName
249 249 FROM PERSON FROM PERSON
File notes/code/sql/HW_ScientificResearch.sql changed (mode: 100644) (index 408fa6e..9c4d322)
1 /* code/sql/HW_SCIENTIFIC_RESEARCH.sql */
2
3
4 1 DROP SCHEMA IF EXISTS HW_SCIENTIFIC_RESEARCH; DROP SCHEMA IF EXISTS HW_SCIENTIFIC_RESEARCH;
2
5 3 CREATE SCHEMA HW_SCIENTIFIC_RESEARCH; CREATE SCHEMA HW_SCIENTIFIC_RESEARCH;
6 USE HW_SCIENTIFIC_RESEARCH;
7 4
5 USE HW_SCIENTIFIC_RESEARCH;
8 6
7 -- start snippet statement
8 /* code/sql/HW_ScientificResearch.sql */
9 9 CREATE TABLE SCIENTIST ( CREATE TABLE SCIENTIST (
10 10 SSN INT PRIMARY KEY, SSN INT PRIMARY KEY,
11 11 Name VARCHAR(30) NOT NULL Name VARCHAR(30) NOT NULL
 
... ... CREATE TABLE PROJECT (
15 15 Code CHAR(4) PRIMARY KEY, Code CHAR(4) PRIMARY KEY,
16 16 Name VARCHAR(150) NOT NULL Name VARCHAR(150) NOT NULL
17 17 ); );
18
18
19 19 CREATE TABLE CONTRIBUTESTO ( CREATE TABLE CONTRIBUTESTO (
20 20 Scientist INT, Scientist INT,
21 21 Project CHAR(4), Project CHAR(4),
22 Hours INT NOT NULL CHECK (Hours > 0),
22 Hours INT,
23 23 PRIMARY KEY (Scientist, Project), PRIMARY KEY (Scientist, Project),
24 FOREIGN KEY (Scientist) REFERENCES SCIENTIST(SSN),
25 FOREIGN KEY (Project) REFERENCES PROJECT(Code)
26 ON DELETE CASCADE
27 ON UPDATE CASCADE
24 FOREIGN KEY (Scientist) REFERENCES SCIENTIST (SSN),
25 FOREIGN KEY (Project) REFERENCES PROJECT (Code) ON DELETE
26 CASCADE ON UPDATE CASCADE
28 27 ); );
29 28
30 29 CREATE TABLE FUNDINGAGENCY ( CREATE TABLE FUNDINGAGENCY (
31 Name VARCHAR(150) PRIMARY KEY,
32 Type ENUM("State", "Federal", "Foundation"),
33 Creation YEAR
30 Name VARCHAR(150) PRIMARY KEY,
31 TYPE ENUM ("State", "Federal", "Foundation"),
32 Creation YEAR
34 33 ); );
35 34
36 35 CREATE TABLE FUNDS ( CREATE TABLE FUNDS (
37 Agency VARCHAR(150),
38 Project CHAR(4),
39 Amount DECIMAL(12, 2),
40 FOREIGN KEY (Agency) REFERENCES FUNDINGAGENCY(Name)
41 ON UPDATE CASCADE
42 ON DELETE RESTRICT,
43 FOREIGN KEY (Project) REFERENCES PROJECT(Code)
36 Agency VARCHAR(150),
37 Project CHAR(4),
38 Amount DECIMAL(12, 2),
39 FOREIGN KEY (Agency) REFERENCES FUNDINGAGENCY (NAME) ON
40 UPDATE CASCADE ON DELETE RESTRICT,
41 FOREIGN KEY (Project) REFERENCES PROJECT (Code)
44 42 ); );
45 43
46
47 INSERT INTO SCIENTIST VALUES
48 ("000000000", "Mike"), -- S.1
49 ("000000001", "Sabine"), -- S.2
50 ("000000002", "James"), -- S.3
51 ("000000003", "Emily"), -- S.4
52 ("000000004", "Claire"); -- S.5
53
54 INSERT INTO PROJECT VALUES
55 ("AA", "Advancing Airplanes"), -- P.1
56 ("BA", "Better Airplanes"), -- P.2
57 ("BB", "Better Buildings"), -- P.3
58 ("CC", "Creative Creation"); -- P.4
59
60 INSERT INTO CONTRIBUTESTO VALUES
61 ("000000001", "AA", 12), -- C.1
62 ("000000001", "BB", 10), -- C.2
63 ("000000002", "AA", 5), -- C.3
64 ("000000003", "BA", 3), -- C.4
65 ("000000000", "BB", 1), -- C.5
66 ("000000000", "AA", 1); -- C.6
67
68 INSERT INTO FUNDINGAGENCY VALUES
69 ("National Science Foundation", "Federal", 1950), -- FA.1
70 ("French-American Cultural Exchange", "Foundation", 2017); -- FA.2
71
72 INSERT INTO FUNDS VALUES
73 ("National Science Foundation", "AA", 100000), -- F.1
74 ("French-American Cultural Exchange", "CC", 10000); -- F.2
75
76 SELECT Name FROM FUNDINGAGENCY WHERE Creation >= 2000;
77
78 SELECT CODE FROM PROJECT WHERE Name LIKE ("%Airplanes%");
79
80 SELECT SUM(Hours) FROM CONTRIBUTESTO WHERE Project = "AA";
81
82 SELECT Project FROM CONTRIBUTESTO, SCIENTIST WHERE SCIENTIST.Name = "Sabine" AND SCIENTIST.SSN = CONTRIBUTESTO.Scientist;
83
84 SELECT PROJECT.Name FROM PROJECT, FUNDS, FUNDINGAGENCY WHERE FUNDINGAGENCY.Type = "Federal" AND FUNDINGAGENCY.Name = FUNDS.Agency AND FUNDS.Project = PROJECT.Code;
85
86 SELECT DISTINCT(Fellow.Name) AS "Mike's fellow" FROM SCIENTIST AS Mike, SCIENTIST AS Fellow, CONTRIBUTESTO AS A, CONTRIBUTESTO AS B WHERE Mike.Name = "Mike" AND Mike.SSN = A.Scientist AND A.Project = B.Project AND B.Scientist = Fellow.SSN AND NOT Fellow.Name = "Mike";
87
88 SELECT DISTINCT(PROJECT.Name) FROM PROJECT, FUNDS WHERE NOT PROJECT.Code IN (SELECT FUNDS.Project FROM FUNDS);
89
90 SELECT SCIENTIST.Name FROM SCIENTIST, CONTRIBUTESTO WHERE CONTRIBUTESTO.Hours >= (SELECT MAX(Hours) FROM CONTRIBUTESTO, PROJECT WHERE PROJECT.Name = "Advancing Airplanes" AND PROJECT.Code = CONTRIBUTESTO.Project) AND CONTRIBUTESTO.Scientist = SCIENTIST.SSN;
91
92
93
94
95 START TRANSACTION;
96 UPDATE SCIENTIST SET SSN = "000000001" WHERE Name = "Claire";
97 ROLLBACK;
98
99
100 START TRANSACTION;
101 UPDATE FUNDINGAGENCY SET Name = "NSF" WHERE Name = "National Science Foundation";
102 SELECT * FROM FUNDINGAGENCY; -- FA. 1
103 SELECT * FROM FUNDS; -- F.1
104 ROLLBACK;
105
106
107 START TRANSACTION;
108 DELETE FROM FUNDINGAGENCY WHERE Name = "French-American Cultural Exchange";
109 ROLLBACK;
110
111
44 INSERT INTO SCIENTIST
45 VALUES (
46 "000000000",
47 "Mike"), -- S.1
48 (
49 "000000001", "Sabine"), -- S.2
50 (
51 "000000002", "James"), -- S.3
52 (
53 "000000003", "Emily"), -- S.4
54 (
55 "000000004", "Claire");
56
57 -- S.5
58 INSERT INTO PROJECT
59 VALUES (
60 "AA",
61 "Advancing Airplanes"), -- P.1
62 (
63 "BA", "Better Airplanes"), -- P.2
64 (
65 "BB", "Better Buildings"), -- P.3
66 (
67 "CC", "Creative Creation");
68
69 -- P.4
70 INSERT INTO CONTRIBUTESTO
71 VALUES (
72 "000000001",
73 "AA",
74 12), -- C.1
75 (
76 "000000001", "BB", 10), -- C.2
77 (
78 "000000002", "AA", 5), -- C.3
79 (
80 "000000003", "BA", 3), -- C.4
81 (
82 "000000000", "BB", 1), -- C.5
83 (
84 "000000000", "AA", 1);
85
86 -- C.6
87 INSERT INTO FUNDINGAGENCY
88 VALUES (
89 "National Science Foundation",
90 "Federal",
91 1950), -- FA.1
92 (
93 "French-American Cultural Exchange", "Foundation", 2017);
94
95 -- FA.2
96 INSERT INTO FUNDS
97 VALUES (
98 "National Science Foundation",
99 "AA",
100 100000), -- F.1
101 (
102 "French-American Cultural Exchange", "CC", 10000);
103
104 -- F.2
105 -- end snippet statement
File notes/code/sql/HW_ScientificResearchSol.sql added (mode: 100644) (index 0000000..bed42a7)
1 DROP SCHEMA IF EXISTS HW_SCIENTIFIC_RESEARCH;
2
3 CREATE SCHEMA HW_SCIENTIFIC_RESEARCH;
4
5 USE HW_SCIENTIFIC_RESEARCH;
6
7 CREATE TABLE SCIENTIST (
8 SSN INT PRIMARY KEY,
9 Name VARCHAR(30) NOT NULL
10 );
11
12 CREATE TABLE PROJECT (
13 Code CHAR(4) PRIMARY KEY,
14 Name VARCHAR(150) NOT NULL
15 );
16
17 CREATE TABLE CONTRIBUTESTO (
18 Scientist INT,
19 Project CHAR(4),
20 Hours INT NOT NULL CHECK (Hours > 0),
21 PRIMARY KEY (Scientist, Project),
22 FOREIGN KEY (Scientist) REFERENCES SCIENTIST (SSN),
23 FOREIGN KEY (Project) REFERENCES PROJECT (Code) ON DELETE
24 CASCADE ON UPDATE CASCADE
25 );
26
27 CREATE TABLE FUNDINGAGENCY (
28 Name VARCHAR(150) PRIMARY KEY,
29 TYPE ENUM ("State", "Federal", "Foundation"),
30 Creation YEAR
31 );
32
33 CREATE TABLE FUNDS (
34 Agency VARCHAR(150),
35 Project CHAR(4),
36 Amount DECIMAL(12, 2),
37 FOREIGN KEY (Agency) REFERENCES FUNDINGAGENCY (NAME) ON
38 UPDATE CASCADE ON DELETE RESTRICT,
39 FOREIGN KEY (Project) REFERENCES PROJECT (Code)
40 );
41
42 INSERT INTO SCIENTIST
43 VALUES (
44 "000000000",
45 "Mike"), -- S.1
46 (
47 "000000001", "Sabine"), -- S.2
48 (
49 "000000002", "James"), -- S.3
50 (
51 "000000003", "Emily"), -- S.4
52 (
53 "000000004", "Claire");
54
55 -- S.5
56 INSERT INTO PROJECT
57 VALUES (
58 "AA",
59 "Advancing Airplanes"), -- P.1
60 (
61 "BA", "Better Airplanes"), -- P.2
62 (
63 "BB", "Better Buildings"), -- P.3
64 (
65 "CC", "Creative Creation");
66
67 -- P.4
68 INSERT INTO CONTRIBUTESTO
69 VALUES (
70 "000000001",
71 "AA",
72 12), -- C.1
73 (
74 "000000001", "BB", 10), -- C.2
75 (
76 "000000002", "AA", 5), -- C.3
77 (
78 "000000003", "BA", 3), -- C.4
79 (
80 "000000000", "BB", 1), -- C.5
81 (
82 "000000000", "AA", 1);
83
84 -- C.6
85 INSERT INTO FUNDINGAGENCY
86 VALUES (
87 "National Science Foundation",
88 "Federal",
89 1950), -- FA.1
90 (
91 "French-American Cultural Exchange", "Foundation", 2017);
92
93 -- FA.2
94 INSERT INTO FUNDS
95 VALUES (
96 "National Science Foundation",
97 "AA",
98 100000), -- F.1
99 (
100 "French-American Cultural Exchange", "CC", 10000);
101
102 -- F.2
103 -- start snippet solution
104 /* code/sql/HW_ScientificResearchSol.sql */
105 -- List the rows affected (updated or deleted) by the
106 -- following commands.
107 -- If no rows are affected because the command would would
108 -- violate the entity integrity constraint, the referential
109 -- integrity constraint, or if there would be some other kind
110 -- of error, please indicate it.
111 START TRANSACTION;
112 /*
113 UPDATE
114 SCIENTIST
115 SET SSN = "000000001"
116 WHERE Name = "Claire";
117 */
118 -- ERROR 1062 (23000) at line 106: Duplicate entry '1' for
119 -- key 'PRIMARY'
120 ROLLBACK;
121
122 START TRANSACTION;
123
124 UPDATE
125 FUNDINGAGENCY
126 SET Name = "NSF"
127 WHERE Name = "National Science Foundation";
128
129 SELECT *
130 FROM FUNDINGAGENCY;
131
132 -- FA. 1
133 SELECT *
134 FROM FUNDS;
135
136 -- F.1
137 ROLLBACK;
138
139 START TRANSACTION;
140 /*
141 DELETE FROM FUNDINGAGENCY
142 WHERE Name = "French-American Cultural Exchange";
143 */
144 -- ERROR 1451 (23000): Cannot delete or update a parent row:
145 -- a foreign key constraint fails
146 -- (`HW_SCIENTIFIC_RESEARCH`.`FUNDS`, CONSTRAINT
147 -- `FUNDS_ibfk_1` FOREIGN KEY (`Agency`) REFERENCES
148 -- `FUNDINGAGENCY` (`Name`) ON UPDATE CASCADE)
149 ROLLBACK;
150
151 -- List the name of the funding agencies created after 2000
152 -- ("French-American Cultural Exchange")
153 SELECT Name
154 FROM FUNDINGAGENCY
155 WHERE Creation >= 2000;
156
157 -- List the code of the projects that contains the word
158 -- "Airplanes" ("AA", "BA")
159 SELECT CODE
160 FROM PROJECT
161 WHERE Name LIKE ("%Airplanes%");
162
163 -- List the number of hours scientists contributed to the
164 -- project "AA" (18)
165 SELECT SUM(Hours)
166 FROM CONTRIBUTESTO
167 WHERE Project = "AA";
168
169 -- List the code of the projects to which the scientist named
170 -- Sabine contributed ("AA", "BB")
171 SELECT Project
172 FROM CONTRIBUTESTO,
173 SCIENTIST
174 WHERE SCIENTIST.Name = "Sabine"
175 AND SCIENTIST.SSN = CONTRIBUTESTO.Scientist;
176
177 -- Give the name of the projects who benefited from federal
178 -- funds ("Advancing Airplanes")
179 SELECT PROJECT.Name
180 FROM PROJECT,
181 FUNDS,
182 FUNDINGAGENCY
183 WHERE FUNDINGAGENCY.Type = "Federal"
184 AND FUNDINGAGENCY.Name = FUNDS.Agency
185 AND FUNDS.Project = PROJECT.Code;
186
187 -- Give the name of the scientist who contributed to the same
188 -- project as Mike ("Sabine", "James")
189 SELECT DISTINCT (Fellow.Name) AS "Mike's fellow"
190 FROM SCIENTIST AS Mike,
191 SCIENTIST AS Fellow,
192 CONTRIBUTESTO AS A,
193 CONTRIBUTESTO AS B
194 WHERE Mike.Name = "Mike"
195 AND Mike.SSN = A.Scientist
196 AND A.Project = B.Project
197 AND B.Scientist = Fellow.SSN
198 AND NOT Fellow.Name = "Mike";
199
200 -- List the name of the projects that are not funded by an
201 -- agency ("Better Airplanes", "Better Buildings")
202 SELECT DISTINCT (PROJECT.Name)
203 FROM PROJECT,
204 FUNDS
205 WHERE NOT PROJECT.Code IN (
206 SELECT FUNDS.Project
207 FROM FUNDS);
208
209 -- Give the name of the scientist who contributed the most
210 -- (in terms of hours) to the project named "Advancing
211 -- Airplanes" (Sabine)
212 SELECT SCIENTIST.Name
213 FROM SCIENTIST,
214 CONTRIBUTESTO
215 WHERE CONTRIBUTESTO.Hours >= (
216 SELECT MAX(Hours)
217 FROM CONTRIBUTESTO,
218 PROJECT
219 WHERE PROJECT.Name = "Advancing Airplanes"
220 AND PROJECT.Code = CONTRIBUTESTO.Project)
221 AND CONTRIBUTESTO.Scientist = SCIENTIST.SSN;
222
223 -- end snippet solution
File notes/code/sql/HW_SocialMedia.sql changed (mode: 100644) (index 610f009..3ded51f)
... ... VALUES (
75 75 DATE "2019-03-03"); DATE "2019-03-03");
76 76
77 77 -- The first entry means that 2 subscribed to 1, not the -- The first entry means that 2 subscribed to 1, not the
78 -- other way around.
79 -- And similarly for the other entries.
78 -- other way around.
79 -- And similarly for the other entries.
80 80 INSERT INTO VIDEO INSERT INTO VIDEO
81 81 VALUES ( VALUES (
82 82 10, 10,
 
... ... VALUES (
124 124 -- start snippet solution -- start snippet solution
125 125 /* code/sql/HW_SocialMedia.sql */ /* code/sql/HW_SocialMedia.sql */
126 126 -- … the title of all the videos ("My first video!", "My -- … the title of all the videos ("My first video!", "My
127 -- second video!", "My vacations").
127 -- second video!", "My vacations").
128 128 SELECT TITLE SELECT TITLE
129 129 FROM VIDEO; FROM VIDEO;
130 130
131 131 -- … the release date of the video whose title is "My first -- … the release date of the video whose title is "My first
132 -- video!" ("2020-02-02").
132 -- video!" ("2020-02-02").
133 133 SELECT Released SELECT Released
134 134 FROM VIDEO FROM VIDEO
135 135 WHERE Title = "My first video!"; WHERE Title = "My first video!";
136 136
137 137 -- … the ID of the account(s) where the "Name" attribute -- … the ID of the account(s) where the "Name" attribute
138 -- was not given ("2").
138 -- was not given ("2").
139 139 SELECT ID SELECT ID
140 140 FROM ACCOUNT FROM ACCOUNT
141 141 WHERE Name IS NULL; WHERE Name IS NULL;
142 142
143 143 -- … the ID of the videos whose title contains the word -- … the ID of the videos whose title contains the word
144 -- "video" ("10", "20").
144 -- "video" ("10", "20").
145 145 SELECT ID SELECT ID
146 146 FROM VIDEO FROM VIDEO
147 147 WHERE TITLE LIKE "%video%"; WHERE TITLE LIKE "%video%";
 
... ... FROM VIDEO
152 152 WHERE Title REGEXP 'video'; WHERE Title REGEXP 'video';
153 153
154 154 -- … the number of thumbs up for the video with title "My -- … the number of thumbs up for the video with title "My
155 -- vacations" ("1").
155 -- vacations" ("1").
156 156 SELECT COUNT(*) SELECT COUNT(*)
157 157 FROM THUMBS_UP, FROM THUMBS_UP,
158 158 VIDEO VIDEO
 
... ... ORDER BY Released ASC
180 180 LIMIT 1; LIMIT 1;
181 181
182 182 -- … the names of the accounts who gave a thumbs up to the -- … the names of the accounts who gave a thumbs up to the
183 -- video with id 30 ("Bob Ross").
183 -- video with id 30 ("Bob Ross").
184 184 SELECT Name SELECT Name
185 185 FROM ACCOUNT, FROM ACCOUNT,
186 186 THUMBS_UP THUMBS_UP
 
... ... WHERE THUMBS_UP.Video = 30
188 188 AND THUMBS_UP.Account = ACCOUNT.ID; AND THUMBS_UP.Account = ACCOUNT.ID;
189 189
190 190 -- … the ID of the account with the greatest number of -- … the ID of the account with the greatest number of
191 -- subscribers ("2").
191 -- subscribers ("2").
192 192 SELECT Subscribed SELECT Subscribed
193 193 FROM SUBSCRIBE FROM SUBSCRIBE
194 194 GROUP BY Subscribed GROUP BY Subscribed
File notes/code/sql/HW_Storm.sql changed (mode: 100644) (index 9541231..866b642)
... ... VALUES (
36 36 "2017-08-17"); "2017-08-17");
37 37
38 38 -- In the following, the entry gets created, but date is -- In the following, the entry gets created, but date is
39 -- "corrected" to "2017-17-08"!
40 -- INSERT INTO STORM
41 -- VALUES ("Dummy", "Hurricane", 120,
42 -- The error message returned is
43 -- ERROR 1292 (22007) at line 34: Incorrect date
44 -- "2017-17-08" for column
45 -- row 1
46 -- In the following, we explicitely use "DATE", and
47 -- the date is incorrect, nothing gets inserted.
48 -- INSERT INTO STORM
49 -- VALUES ("Dummy2", "Hurricane", 120, DATE
50 -- "2017-17-08");
51 -- ERROR 1525 (HY000) at line 40: Incorrect DATE
52 -- "2017-17-08"
53 -- The next one sets NULL for DATE.
39 -- "corrected" to "2017-17-08"!
40 -- INSERT INTO STORM
41 -- VALUES ("Dummy", "Hurricane", 120,
42 -- "2017-17-08");
43 -- The error message returned is
44 -- ERROR 1292 (22007) at line 34: Incorrect date
45 -- value:
46 -- "2017-17-08" for column
47 -- `HW_STORM`.`STORM`.`Creation`
48 -- at
49 -- row 1
50 -- In the following, we explicitely use "DATE",
51 -- and
52 -- since
53 -- the date is incorrect, nothing gets inserted.
54 -- INSERT INTO STORM
55 -- VALUES ("Dummy2", "Hurricane", 120, DATE
56 -- "2017-17-08");
57 -- ERROR 1525 (HY000) at line 40: Incorrect DATE
58 -- value:
59 -- "2017-17-08"
60 -- The next one sets NULL for DATE.
54 61 INSERT INTO STORM INSERT INTO STORM
55 62 VALUES ( VALUES (
56 63 "Irma", "Irma",
 
... ... VALUES (
85 86 NULL); NULL);
86 87
87 88 -- This instruction is not using the primary key, is that a -- This instruction is not using the primary key, is that a
88 -- problem?
89 -- problem?
89 90 UPDATE UPDATE
90 91 STATE STATE
91 92 SET Affected_by = "Harvey" SET Affected_by = "Harvey"
File notes/code/sql/HW_TextbookAuthoredSol.sql changed (mode: 100644) (index d7dbadf..cfb5c7a)
... ... VALUES (
64 64 'Gaddis', 'Gaddis',
65 65 'Tony'); 'Tony');
66 66
67
68
69
70 67 -- start snippet solution -- start snippet solution
71
72 68 /* /*
73 69 code/sql/HW_TEXTBOOK_AUTHORED_SOL.sql code/sql/HW_TEXTBOOK_AUTHORED_SOL.sql
74 70 */ */
75
76 71 /* /*
77 72 EXERCISE 1 EXERCISE 1
78 73
File notes/code/sql/HW_TriggerExample.sql changed (mode: 100644) (index 964cec6..f4cd7bb)
2 2 DROP SCHEMA IF EXISTS HW_TriggerExample; DROP SCHEMA IF EXISTS HW_TriggerExample;
3 3
4 4 -- To drop only a trigger, you can use -- To drop only a trigger, you can use
5 -- DROP TRIGGER IF EXISTS
6 -- HW_TriggerExample.NUMBER_OF_STUDENT_INC;
7 -- DROP TRIGGER IF EXISTS
8 -- HW_TriggerExample.NUMBER_OF_STUDENT_DEC;
5 -- DROP TRIGGER IF EXISTS
6 -- HW_TriggerExample.NUMBER_OF_STUDENT_INC;
7 -- DROP TRIGGER IF EXISTS
8 -- HW_TriggerExample.NUMBER_OF_STUDENT_DEC;
9 9 CREATE SCHEMA HW_TriggerExample; CREATE SCHEMA HW_TriggerExample;
10 10
11 11 USE HW_TriggerExample; USE HW_TriggerExample;
 
... ... CREATE TRIGGER STUDENT_AVERAGE
83 83 WHERE STUDENT.Login = NEW.Student; WHERE STUDENT.Login = NEW.Student;
84 84
85 85 -- The "NEW" keyword here refers to the "new" entry -- The "NEW" keyword here refers to the "new" entry
86 -- that is being inserted by the INSERT statement
87 -- triggering
88 -- the trigger.
89 -- end snippet trigger-3
86 -- that is being inserted by the INSERT statement
87 -- triggering
88 -- the trigger.
89 -- end snippet trigger-3
90 90 INSERT INTO GRADE INSERT INTO GRADE
91 91 VALUES ( VALUES (
92 92 "A", "A",
 
... ... SELECT *
112 112 FROM STUDENT; FROM STUDENT;
113 113
114 114 -- Tada, all the averages have been computed! -- Tada, all the averages have been computed!
115 -- Note also that the student "C" does not have an
116 -- average!
115 -- Note also that the student "C" does not have an
116 -- average!
File notes/code/sql/HW_Work.sql changed (mode: 100644) (index 0096c9b..e750737)
... ... VALUES (
100 100 So, "Successful insertion". So, "Successful insertion".
101 101 */ */
102 102 -- The following statement raises an error. -- The following statement raises an error.
103 -- INSERT INTO AUTHOR
104 -- VALUES ("Mary B.", "mb@fai.fr", NULL);
103 -- INSERT INTO AUTHOR
104 -- VALUES ("Mary B.", "mb@fai.fr", NULL);
105 105 /* /*
106 106 ERROR 1136 (21S01): Column count doesn't match value count at row 1 ERROR 1136 (21S01): Column count doesn't match value count at row 1
107 107 So, "Other kind of error". So, "Other kind of error".
108 108 */ */
109 109 -- The following statement raises an error. -- The following statement raises an error.
110 -- INSERT INTO WORK
111 -- VALUES ("My Life", "Claude A.");
110 -- INSERT INTO WORK
111 -- VALUES ("My Life", "Claude A.");
112 112 /* /*
113 113 ERROR 1452 (23000): Cannot add or update a child row: a foreign key constraint fails ERROR 1452 (23000): Cannot add or update a child row: a foreign key constraint fails
114 114 (`HW_EXAM_1`.`WORK`, CONSTRAINT `WORK_ibfk_1` FOREIGN KEY (`Author`) REFERENCES `AUTHOR` (`Name`) (`HW_EXAM_1`.`WORK`, CONSTRAINT `WORK_ibfk_1` FOREIGN KEY (`Author`) REFERENCES `AUTHOR` (`Name`)
 
... ... VALUES (
128 128 So, "Successful insertion". So, "Successful insertion".
129 129 */ */
130 130 -- The following statement raises an error. -- The following statement raises an error.
131 -- INSERT INTO AUTHOR
132 -- VALUES ("Virginia W.", "alt@isp.net");
131 -- INSERT INTO AUTHOR
132 -- VALUES ("Virginia W.", "alt@isp.net");
133 133 /* /*
134 134 ERROR 1062 (23000): Duplicate entry 'Virginia W.' for key 'PRIMARY' ERROR 1062 (23000): Duplicate entry 'Virginia W.' for key 'PRIMARY'
135 135 So, "Entity integrity constraint". So, "Entity integrity constraint".
 
... ... WHERE Title = "What to eat";
175 175 Does not change any row. Does not change any row.
176 176 */ */
177 177 -- The following statement raises an error. -- The following statement raises an error.
178 -- DELETE FROM AUTHOR
179 -- WHERE Name = "Virginia W.";
178 -- DELETE FROM AUTHOR
179 -- WHERE Name = "Virginia W.";
180 180 /* /*
181 181 ERROR 1451 (23000): Cannot delete or update a parent row: a foreign key constraint fails ERROR 1451 (23000): Cannot delete or update a parent row: a foreign key constraint fails
182 182 (`HW_EXAM_1`.`BOOK`, CONSTRAINT `BOOK_ibfk_1` FOREIGN KEY (`Work`) REFERENCES `WORK` (`Title`) ON UPDATE CASCADE) (`HW_EXAM_1`.`BOOK`, CONSTRAINT `BOOK_ibfk_1` FOREIGN KEY (`Work`) REFERENCES `WORK` (`Title`) ON UPDATE CASCADE)
 
... ... WHERE Title = "What to eat";
185 185 ROLLBACK; ROLLBACK;
186 186
187 187 -- We go back to the previous state. -- We go back to the previous state.
188 -- You can now assume that there is more data than
189 -- inserted, if that helps you. Write a command that
190 -- selects
191 -- …
192 -- We insert some dummy values for this next part.
188 -- You can now assume that there is more data than
189 -- what
190 -- we
191 -- inserted, if that helps you. Write a command
192 -- that
193 -- selects
194 -- …
195 -- We insert some dummy values for this next part.
193 196 INSERT INTO WORK INSERT INTO WORK
194 197 VALUES ( VALUES (
195 198 "My Life", "My Life",
 
... ... SELECT Price
229 230 FROM EBOOK; FROM EBOOK;
230 231
231 232 -- … the (distinct) names of the authors who have authored -- … the (distinct) names of the authors who have authored
232 -- a piece of work.
233 -- a piece of work.
233 234 SELECT DISTINCT Author SELECT DISTINCT Author
234 235 FROM WORK; FROM WORK;
235 236
 
... ... SELECT MAX(Price)
255 256 FROM BOOK; FROM BOOK;
256 257
257 258 -- … the number of pieces of work written by the author -- … the number of pieces of work written by the author
258 -- whose name is “Virginia W.”.
259 -- whose name is “Virginia W.”.
259 260 SELECT COUNT(*) SELECT COUNT(*)
260 261 FROM WORK FROM WORK
261 262 WHERE WORK.Author = "Virginia W."; WHERE WORK.Author = "Virginia W.";
262 263
263 264 -- … the email of the author who wrote the piece of work -- … the email of the author who wrote the piece of work
264 -- called “My Life”.
265 -- called “My Life”.
265 266 SELECT Email SELECT Email
266 267 FROM AUTHOR, FROM AUTHOR,
267 268 WORK WORK
 
... ... WHERE WORK.Title = "My Life"
269 270 AND WORK.Author = AUTHOR.Name; AND WORK.Author = AUTHOR.Name;
270 271
271 272 -- the isbn(s) of the book containing a work written by the -- the isbn(s) of the book containing a work written by the
272 -- author whose email is "vw@isp.net".
273 -- author whose email is "vw@isp.net".
273 274 SELECT ISBN SELECT ISBN
274 275 FROM BOOK, FROM BOOK,
275 276 WORK, WORK,
 
... ... WHERE
297 298 they are both given the title "BANNED", which violates the unicity of value in primary keys. they are both given the title "BANNED", which violates the unicity of value in primary keys.
298 299 */ */
299 300 -- Write one or multiple commands that would delete the work -- Write one or multiple commands that would delete the work
300 -- whose title is “My Life”, as well as all of
301 -- books
302 -- and ebooks versions of it.
303 -- The following statement raises an error.
304 -- DELETE FROM WORK
305 -- WHERE Title = "My Life";
301 -- whose title is “My Life”, as well as all of
302 -- the
303 -- books
304 -- and ebooks versions of it.
305 -- The following statement raises an error.
306 -- DELETE FROM WORK
307 -- WHERE Title = "My Life";
306 308 /* /*
307 309 Fails Fails
308 310 ERROR 1451 (23000): Cannot delete or update a parent row: a foreign key constraint fails ERROR 1451 (23000): Cannot delete or update a parent row: a foreign key constraint fails
File notes/lectures_notes.md changed (mode: 100644) (index 94b7beb..79bc984)
... ... Problem (A simple database for authors of textbooks) +.#project1
4119 4119
4120 4120 --- ---
4121 4121
4122 ---
4123
4124 4122 Problem (A simple database for capstone projects) +.#project1bis Problem (A simple database for capstone projects) +.#project1bis
4125 4123 ~ ~
4126 4124
 
... ... Problem (A database for residencies) +.#residency
4226 4224 @problem:residency -- Question -.# @problem:residency -- Question -.#
4227 4225 : Discuss why the primary key identified from the previous question for the `RESIDENCY` table is a good choice. : Discuss why the primary key identified from the previous question for the `RESIDENCY` table is a good choice.
4228 4226
4227
4228 ---
4229
4230 Problem (A database for research fundings) +.#research-funding
4231 ~
4232
4233 Consider the following code:
4234
4235
4236 ```{.sqlmysql .numberLines include=code/sql/HW_ScientificResearch.sql snippet=statement}
4237 ```
4238 Note that each row inserted in the tables is given a name and noted as afterwards as a comment (`"S.1, S.2, P.1, C.1, FA.1"`, etc.).
4239
4240 Answer the following questions and problems, assuming that none of the commands in the rest of the problem are actually executed.
4241
4242 @problem:research-funding -- Question -.#
4243
4244 : Draw the relational model corresponding to this series of commands (it is not necessary to include the state).
4245
4246 @problem:research-funding -- Question -.#
4247
4248 : Draw the relational model corresponding to this series of commands (no need to include the state).
4249
4250 @problem:research-funding -- Question -.#
4251
4252 : How could you edit line 12 so that negative values and `NULL`{.sql} would not be admitted as values for `Hours`{.sql}?
4253
4254 @problem:research-funding -- Question -.#
4255
4256 : Write a command that would violate the referential integrity constraint.
4257
4258 @problem:research-funding -- Question -.#
4259
4260 : List the rows affected (updated or deleted) by the following commands. If no rows are affected because the command would would violate the entity integrity constraint, the referential integrity constraint, or if there would be some other kind of error, please indicate it.
4261
4262 #. `UPDATE SCIENTIST SET SSN = "000000001" WHERE Name = "Claire";`{.sql}
4263 #. `UPDATE FUNDINGAGENCY SET Name = "NSF" WHERE Name = "National Science Foundation";`{.sql}
4264 #. `DELETE FROM FUNDINGAGENCY WHERE Name = "French-American Cultural Exchange";`{.sql}
4265
4266 @problem:research-funding -- Question -.#
4267
4268 : Write a query that selects …(In parenthesis, the values returned *in this set-up*, but you have to be general.)
4269
4270 #. …the name of the funding agencies created after 2000 (\"French-American Cultural Exchange\")
4271
4272 #. …the code of the projects that contains the word \"Airplanes\" (\"AA\", \"BA\")
4273
4274 #. …the number of hours scientists contributed to the project \"AA\" (18)
4275
4276 #. …the code of the projects to which the scientist named Sabine contributed (\"AA\", \"BB\")
4277
4278 #. …the name of the projects who benefited from federal funds (\"Advancing Airplanes\")
4279
4280 #. …the name of the scientist who contributed to the same project as Mike (\"Sabine\", \"James\")
4281
4282 #. …the name of the projects that are not funded by an agency (\"Better Airplanes\", \"Better Buildings\")
4283
4284 #. …the name of the scientist who contributed the most (in terms of hours) to the project named \"Advancing Airplanes\" (Sabine).
4285
4286 @problem:research-funding -- Question -.#
4287
4288 : Identify and discuss two limitations of this model, and offer a way to remedy at least one of them.
4289
4290
4229 4291 ## Solutions to Selected Problems {-} ## Solutions to Selected Problems {-}
4230 4292
4231 4293
 
... ... Solution to [%D %n (%T)](#problem:residency)
4954 5016 The second key could make sense, since it would refrain a person from declaring the same address twice as their residency. The second key could make sense, since it would refrain a person from declaring the same address twice as their residency.
4955 5017 The only case that could be hard to work around is if a person was trying to own multiple units at the same address; however, this is more an issue with the primary key of `HOUSE` than an issue with the primary key we suggested for `RESIDENCY`. The only case that could be hard to work around is if a person was trying to own multiple units at the same address; however, this is more an issue with the primary key of `HOUSE` than an issue with the primary key we suggested for `RESIDENCY`.
4956 5018
5019
5020 ---
5021
5022 Solution to [%D %n (%T)](#problem:research-funding)
5023 ~
5024 (Some of) the answers can be found in the following snippet:
5025
5026 ```{.sqlmysql .numberLines include=code/sql/HW_ScientificResearchSol.sql snippet=solution}
5027 ```
5028
5029
4957 5030 # Designing a Good Database # Designing a Good Database
4958 5031
4959 5032 ## Resources {-} ## Resources {-}
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