October 2002
Beginner
864 pages
18h 41m
English
Content preview from Sams Teach Yourself SQL in 21 Days, Fourth Edition
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Day 10. Controlling Data Integrity
Today, you will learn about table constraints and how these constraints allow you to control the data that is inserted into your database. You will also get plenty of practice creating tables, dropping tables, and re-creating them with constraints. By the end of the day, you should understand the following things about constraints:
What they are and how they are used
The different types of constraints
How to create constraints using SQL
The difference between data integrity and referential integrity
How to manage constraints
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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.