April 2007
Intermediate to advanced
1032 pages
19h 28m
English
book
SQL for MySQL Developers: A Comprehensive Tutorial and Reference
by Rick F. van der Lans, Diane Cools
Content preview from SQL for MySQL Developers: A Comprehensive Tutorial and Reference
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Chapter 11. SELECT Statement: The HAVING Clause
11.1 Introduction
The purpose of the HAVING clause of a select block is comparable to that of the WHERE clause. The difference is that the WHERE clause is used to select rows after the FROM clause has been processed, whereas the HAVING clause is used to select rows after a GROUP BY clause has been executed. A HAVING clause can be used without a GROUP BY clause.
Definition
<having clause> ::= HAVING <condition>
In the previous chapter, you saw that the GROUP BY clause groups the rows of the result from the FROM clause. The HAVING clause enables you to select groups (with rows) based upon their ...
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