January 2020
Beginner
256 pages
5h 11m
English
Content preview from Sams Teach Yourself SQL in 10 Minutes a Day, 5th Edition
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Lesson 22. Understanding Advanced SQL Features
In this lesson, you’ll look at several of the advanced data manipulation features that have evolved with SQL: constraints, indexes, and triggers.
Understanding Constraints
SQL has evolved through many versions to become a very complete and powerful language. Many of the more powerful features are sophisticated tools that provide you with data manipulation techniques such as constraints.
Relational tables and referential integrity have both been discussed several times in prior lessons. As I explained in those lessons, relational databases store data broken into multiple tables, each of which stores related data. Keys are used to create references from one table to another (thus the term referential ...
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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.