Question 5I Consider the following database instance. Table name: Student Primary key: SID SID SNAME Fred 1. Mack 3. Shell Table name: Course Primary key: CID CID CNAME Finance 2. CIS Table name: Register Primary key: SID,CID 2)
Question 5I Consider the following database instance. Table name: Student Primary key: SID SID SNAME Fred 1. Mack 3. Shell Table name: Course Primary key: CID CID CNAME Finance 2. CIS Table name: Register Primary key: SID,CID 2)
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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Question 5I
Consider the following database instance.
For each of the following questions, show the contents of the database (1,e, re-draw the
tables showing the data) after performing the given SQL statements. Assume each SQL
statement is performed on the original database instance considering the effect of the
previous statements, so these are done in the order listed. After each step the data is
committed (written) to the database.
Table name: Student
Primary key: SID
SID
SNAME
5.1)
2.
Fred
delete from Student where sid = 1:
commit:
Mack
Shell
Table name: Course
5.2)
Primary key: CID
update Course set cid 5 where cid 1:
commit:
CID
CNAME
1
Finance
CIS
Table name: Register
5.3)
Primary key: SID.CID
Foreign key: SID references Student(SID)
on delete cascade
insert Register values(3,2);
commit
Foreign key: CID references Course(CID)
on update cascade
CID
SID
2.
5.4)
1
2.
update Register set gid = 1 where sid=2
commit
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