Chapter 14. Working with Subqueries
In this chapter, you’ll learn what subqueries are and how to use them.
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.
Query. Any SQL statement. However, the term is usually used to refer to
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. ...