March 2000
Beginner
464 pages
9h 17m
English
Content preview from Sams Teach Yourself SQL in 24 Hours, Second Edition
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What Is a View?
A view is a virtual table. That is, a view looks like a table and acts like a table as far as a user is concerned. A view is actually a composition of a table in the form of a predefined query. For example, a view can be created from the EMPLOYEE_TBL table that contains only the employee's name and address, instead of all columns in the EMPLOYEE_TBL table. A view can contain all rows of a table or select rows from a table. A view can be created from one or many tables.
A view is a predefined query that is stored in the database, has the appearance of an ordinary table, and is accessed like a table, but does not require physical storage.
When a view is created, a SELECT statement is actually run against the database, which defines ...
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