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
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Chapter 26. Views
26.1 Introduction
MySQL supports two types of tables: real tables, generally known as base tables, and derived tables, also called views. Base tables are created with CREATE TABLE statements and are the only ones in which data can be stored. Examples are the PLAYERS and TEAMS tables from the tennis club database.
A derived table, or view, stores no rows itself. Instead, it serves as a prescription or formula for combining certain data from base tables to make a “virtual” table. The word virtual is used because the contents of a view exist only when it is used in a statement. At that moment, MySQL retrieves the prescription that makes up the view formula, executes it, and presents the user with what seems to be a real table. ...
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