March 2003
Beginner
672 pages
14h
English
book
Database Design for Mere Mortals™: A Hands-On Guide to Relational Database Design, Second Edition
by Michael J. Hernandez
Content preview from Database Design for Mere Mortals™: A Hands-On Guide to Relational Database Design, Second Edition
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Establishing Each Relationship
This process involves defining an explicit logical connection between a pair of related tables. The type of relationship that exists between the tables determines the manner in which you define the connection.
One-to-One and One-to-Many Relationships
You use a primary key and a foreign key to establish the connection between tables participating in a one-to-one or one-to-many relationship. (You'll learn the definition of a foreign key in just a moment.)
The One-to-One Relationship
In this type of relationship, one table serves as a parent table and the other serves as a child table. A record must exist in the parent table before you can enter a related record in the child table; stated another way, ...
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