December 2005
Intermediate to advanced
336 pages
4h 52m
English
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Chapter 14. Working with Subqueries
In this chapter, you’ll learn what subqueries are and how to use them.
Understanding Subqueries
Note
Version Requirements. Support for subqueries was introduced in MySQL 4.1. To use the SQL described in this chapter, you must be running MySQL 4.1 or later.
SELECT statements are SQL queries. All the SELECT statements you have seen thus far are simple queries: single statements retrieving data from individual database tables.
New Term
Query. Any SQL statement. However, the term is usually used to refer to SELECT statements.
SQL also enables you to create subqueries: queries that are embedded into other queries. Why would you want to do this? The best way to understand this concept is to look at a couple of examples. ...
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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.
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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.