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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Table-Level Integrity
This type of integrity is a major component of overall data integrity, and it ensures the following:
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There are no duplicate records in a table.
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The primary key exclusively identifies each record in a table.
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Every primary key value is unique.
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Primary key values are not null.
You began establishing table-level integrity when you defined a primary key for each table and ensured its enforcement by making absolutely certain that each primary key fully complied with the Elements of a Primary Key. In the next chapter, you'll enhance the table's integrity further as you establish field specifications for each field within the table.
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