May 2009
Beginner
840 pages
16h 18m
English
book
Sams Teach Yourself SQL in One Hour a Day, Fifth Edition
by Ryan Stephens, Ron Plew, Arie D. Jones
Content preview from Sams Teach Yourself SQL in One Hour a Day, Fifth Edition
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LESSON 10Controlling Data Integrity
In this lesson, you will learn about table constraints and how they 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 lesson, 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
Introducing Constraints
A constraint is an object in a relational database that places rules on data inserted into a column of a table. This lesson covers the several types of ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.