David M. Kroenke and David J. Auer Database Processing: SQL for ...
David M. Kroenke and David J. Auer Database Processing: SQL for ...
David M. Kroenke and David J. Auer Database Processing: SQL for ...
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<strong>SQL</strong> Views• <strong>SQL</strong> view is a virtual table that is constructed from othertables or views.• It has no data of its own, but obtains data from tables orother views.• SELECT statements are used to define views:– A view definition may not include an ORDER BY clause.• <strong>SQL</strong> views are a subset of the external views:– They can be used only <strong>for</strong> external views that involve onemultivalued path through the schema.KROENKE AND AUER - DATABASE PROCESSING, 11th Edition© 2010 Pearson Prentice Hall7-38