December 2002
Intermediate to advanced
1560 pages
40h 44m
English
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Types of Data Integrity
How integrity is enforced depends on the type of integrity being enforced. The types of data integrity are Domain, Entity, and Referential.
Domain Integrity
Domain integrity refers to restricting the values that are valid for a column and the allowance or absence of nulls. Domain integrity is enforced by the datatype, restriction of the use of nulls, and validity checking such as is done with check constraints.
Entity Integrity
Entity integrity requires that all rows in a table be unique. This is enforced with a unique identifier known as the primary key.
Referential Integrity
Referential integrity maintains the dependent values between tables. Referential integrity is enforced with a primary key/foreign key relationship. ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.