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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?

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 System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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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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