December 2014
Intermediate to advanced
852 pages
17h 57m
English
Content preview from Joe Celko's SQL for Smarties, 5th Edition
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Chapter 6
VIEWs, Derived, and Other Virtual Tables
Abstract
Unlike files and older database models, not all tables have a physical existence. Virtual tables are a major tool in SQL.
Keywords
Calculated column
CREATE VIEW
INSTEAD OF triggers
Materialized query tables
Nested VIEWs
Translated column
VIEW materialization
VIEW updating
WITH CHECK OPTION clause
WITH RECURSIVE clause
Views are also called virtual tables, to distinguish it from temporary and base tables which are persistent. Views and derived tables are the ways of putting a query into a named schema object. By that, I mean these things hold the query code rather than the results of the query. The query is executed and the results are effectively materialized as a table with the ...
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