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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Relationship-Level Integrity
A relationship attains relationship-level integrity after you've verified that it is properly established and its characteristics are suitably set. Relationship-level integrity warrants the following:
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The connection between the two tables (or key fields) in a relationship is sound. You accomplished this by using primary and foreign key fields to establish a one-to-one or a one-to-many relationship and a linking table to establish a many-to-many relationship.
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You can insert new records into each table in a meaningful manner. You ensured this by designating the appropriate type of participation for each table (or key field) within the relationship.
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You can delete an existing record without producing any adverse ...
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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.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
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.