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 14. Combining Table Expressions
14.1 Introduction
Section 6.4 introduced the term compound table expression. Set operators allow us to combine multiple table expressions into one compound table expression. Examples in Section 6.4 and several other chapters used the set operator called UNION, which places results of table expressions underneath each other. MySQL supports other set operators besides the UNION operator:
• UNION
• UNION DISTINCT
• UNION ALL
Chapter 6, “SELECT Statements, Table Expressions, and Subqueries,” defined the table expression and the compound table expression. However, that chapter mentions only the UNION operator. Now we extend that definition with the complete set of set operators.
Definition
<table expression> ...
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