A Guide to SQL
9th Edition
ISBN: 9781111527273
Author: Philip J. Pratt
Publisher: Course Technology Ptr
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Chapter 7, Problem 22RQ
Explanation of Solution
Referential integrity:
- Referential integrity is the rule that if a table “R” contains a foreign key that equals the table “Q” primary key, then the value of this foreign key must either equivalent value of the primary key for some row in the table “Q” or be null.
Example:
The example for the referential integrity constraints is given below:
STUDENT table:
| STUDENT_ID | STUDENT_NAME | DEPARTMENT |
| 304 | John | Computer Science |
| 608 | Rose | Earth Science |
BOOKS table:
| BOOK_ID | BOOK_NAME | STUDENT_ID |
| CS123 | SQL | 304 |
| CS576 | C++ | 304 |
| CS876 | Java Programming | 302 |
| ES103 | Earth Science Basics | 608 |
Explanation:
From the above two tables,
- The primary key of “STUDENT” table is “STUDENT_ID”.
- The primary key of “BOOKS” table is “BOOK_ID” and the foreign key of “BOOKS” table is “STUDENT_ID”...
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Chapter 7 Solutions
A Guide to SQL
Ch. 7 - What is a view?Ch. 7 - Which command creates a view?Ch. 7 - Prob. 3RQCh. 7 - What happens when a user retrieves data from a...Ch. 7 - What are three advantages of using views?Ch. 7 - Which command deletes a view?Ch. 7 - Prob. 8RQCh. 7 - Which command terminates previously granted...Ch. 7 - Prob. 10RQCh. 7 - How do you create an index? How do you create a...
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