id in Company references id in Corporation. cid in Department references cid in Company. Each option starts from the original tables (given above) NOT from the tables modified by the previous option You don't need to copy the entire table. Just explain the action of each operation. (d) Suppose that all the foreign keys are declared using on delete restrict. What is the effect of the instruction delete from Company where cid=2?

Database Systems: Design, Implementation, & Management
11th Edition
ISBN:9781285196145
Author:Steven, Steven Morris, Carlos Coronel, Carlos, Coronel, Carlos; Morris, Carlos Coronel and Steven Morris, Carlos Coronel; Steven Morris, Steven Morris; Carlos Coronel
Publisher:Steven, Steven Morris, Carlos Coronel, Carlos, Coronel, Carlos; Morris, Carlos Coronel and Steven Morris, Carlos Coronel; Steven Morris, Steven Morris; Carlos Coronel
Chapter10: Transaction Management And Concurrency Control
Section: Chapter Questions
Problem 1P
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Question
Given the following database instance:
Department:
did cid
1
2
2
Company:
cid | id
3
2
Corporation:
id
4
1
15
15
2
17
6.
1
17
3
15
7
3
20
4
20
8
3
15
9
1
10
2
11
4
12
5
Assumptions:
id in Company references id in Corporation.
cid in Department references cid in Company.
Each option starts from the original tables (given above) NOT from the tables
modified by the previous option
You don't need to copy the entire table. Just explain the action of each operation.
(d) Suppose that all the foreign keys are declared using on delete restrict. What is the
effect of the instruction delete from Company where cid%3D2?
(e) Suppose that all the foreign keys are declared using on delete cascade. What is the
effect of the instruction delete from Corporation where id=15?
(f) Suppose that all the foreign keys are declared using on update set NULL. What is the
effect of the instruction update Company set cid%36 where cid-2?
Transcribed Image Text:Given the following database instance: Department: did cid 1 2 2 Company: cid | id 3 2 Corporation: id 4 1 15 15 2 17 6. 1 17 3 15 7 3 20 4 20 8 3 15 9 1 10 2 11 4 12 5 Assumptions: id in Company references id in Corporation. cid in Department references cid in Company. Each option starts from the original tables (given above) NOT from the tables modified by the previous option You don't need to copy the entire table. Just explain the action of each operation. (d) Suppose that all the foreign keys are declared using on delete restrict. What is the effect of the instruction delete from Company where cid%3D2? (e) Suppose that all the foreign keys are declared using on delete cascade. What is the effect of the instruction delete from Corporation where id=15? (f) Suppose that all the foreign keys are declared using on update set NULL. What is the effect of the instruction update Company set cid%36 where cid-2?
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