An EXISTS predicate tests for the existence
of a row satisfying the search condition of a subquery. The predicate
evaluates to TRUE if at least one row satisfies the search condition
of the subquery.
Scope |
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SQL Data Manipulation Statements
SQL Syntax |
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Parameters |
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Description |
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Unlike other places in which subqueries occur, the EXISTS
predicate allows the subquery to specify more than one column in
its select list.
Example |
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Get supplier names for suppliers who provide at least one
part.
SELECT S.SNAME
FROM S
WHERE EXISTS ( SELECT * FROM SP
WHERE SP.SNO = S.SNO ); |
