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 Relationship Characteristics
Now you'll establish the characteristics of each relationship. These characteristics indicate what will occur when you delete a record, the type of participation each table bears within the relationship, and to what degree each table participates in the relationship.
Defining a Deletion Rule for Each Relationship
The first characteristic you'll establish for the relationship is a deletion rule. This rule determines what your RDBMS should do when you place a request to delete a given record in the parent table of the relationship. Deletion rules are crucial to relationship-level integrity because they help guard against orphaned records, which are records in the child table that have no relationship ...
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