February 2000
Intermediate to advanced
592 pages
14h 36m
English
Content preview from The Guru's Guide to Transact-SQL
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7 Views
Where is the information? Lost in the data.Where is the data? Lost in the #@%!& database!—Joe Celko
VIEWs are static queries that you can use as though they were tables. A VIEW consists of a SELECT statement compiled ahead of time using SQL’s CREATE VIEW command and referenced in the same manner as a table. VIEW columns can consist of table columns, aggregates, constants, and expressions (computed columns). Some VIEWs are updatable; some aren’t. Whether a VIEW is updatable depends largely on whether SQL Server can resolve an update to one of its rows to a single row in an underlying base table. All VIEWs must eventually reference a base table or nontabular expression (an expression that doesn’t require a table—GETDATE(), for ...
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