24 lines
675 B
PHP
24 lines
675 B
PHP
Syntax:
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<code>
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//operand// IN (//subquery//|//value list//)
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</code>
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An IN conditional expression returns true if the //operand// is found from result of the //subquery//
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or if its in the specificied comma separated //value list//, hence the IN expression is always false if the result of the subquery
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is empty.
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When //value list// is being used there must be at least one element in that list.
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<code>
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FROM C1 WHERE C1.col1 IN (FROM C2(col1));
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FROM User WHERE User.id IN (1,3,4,5)
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</code>
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The keyword IN is an alias for = ANY. Thus, these two statements are equal:
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<code>
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FROM C1 WHERE C1.col1 = ANY (FROM C2(col1));
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FROM C1 WHERE C1.col1 IN (FROM C2(col1));
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</code>
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