1. checkout_date and dvd_ID coulmns should be combined together as a composite primary key of the rental table, and rest columns are NOT NULL constraints except the checkin_date column (it might hold NULL values). 2. Rental table is a child table, and the member_id column is a foreign key column which references member table’s member_id primary key column. 3. Rental table is a child table, and the dvd_id column is a foreign key column which references dvd table’s dvd_id primary key column.
1. checkout_date and dvd_ID coulmns should be combined together as a composite primary key of the rental table, and rest columns are NOT NULL constraints except the checkin_date column (it might hold NULL values). 2. Rental table is a child table, and the member_id column is a foreign key column which references member table’s member_id primary key column. 3. Rental table is a child table, and the dvd_id column is a foreign key column which references dvd table’s dvd_id primary key column.
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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Q1. Please write SQL codes to create below rental
child table
RENTAL |
1. checkout_date and dvd_ID coulmns should be combined together as a composite primary key of the rental table, and rest columns are NOT NULL constraints except the checkin_date column (it might hold NULL values).
2. Rental table is a child table, and the member_id column is a foreign key column which references member table’s member_id primary key column.
3. Rental table is a child table, and the dvd_id column is a foreign key column which references dvd table’s dvd_id primary key column.
DESC rental
Name | Null? | Type |
checkout_date | NOT NULL | DATE |
dvd_ID | NOT NULL | NUMBER(4, 0) |
member_ID | NOT NULL | NUMBER(4, 0) |
checkin_date | DATE | |
expred_date | NOT NULL | DATE |
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