SELECT使用方法简介.doc
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SELECT
Purpose
UseaSELECTstatementorsubquerytoretrievedatafromoneormoretables,objecttables,views,objectviews,ormaterializedviews.
IfpartoralloftheresultofaSELECTstatementisequivalenttoanexistingmaterializedview,thenOracleDatabasemayusethematerializedvie
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