51 lines
1.5 KiB
PHP
51 lines
1.5 KiB
PHP
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Syntax:
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<div class='sql'>
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<pre>
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operand comparison_operator ANY (subquery)
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operand comparison_operator SOME (subquery)
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operand comparison_operator ALL (subquery)
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</pre>
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</div>
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An ALL conditional expression returns true if the comparison operation is true for all values
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in the result of the subquery or the result of the subquery is empty. An ALL conditional expression
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is false if the result of the comparison is false for at least one row, and is unknown if neither true nor
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false.
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<br \><br \>
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<div class='sql'>
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<pre>
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FROM C WHERE C.col1 < ALL (FROM C2(col1))
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</pre>
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</div>
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An ANY conditional expression returns true if the comparison operation is true for some
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value in the result of the subquery. An ANY conditional expression is false if the result of the subquery
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is empty or if the comparison operation is false for every value in the result of the subquery, and is
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unknown if neither true nor false.
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<div class='sql'>
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<pre>
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FROM C WHERE C.col1 > ANY (FROM C2(col1))
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</pre>
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</div>
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The keyword SOME is an alias for ANY.
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<div class='sql'>
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<pre>
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FROM C WHERE C.col1 > SOME (FROM C2(col1))
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</pre>
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</div>
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<br \>
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The comparison operators that can be used with ALL or ANY conditional expressions are =, <, <=, >, >=, <>. The
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result of the subquery must be same type with the conditional expression.
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<br \><br \>
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NOT IN is an alias for <> ALL. Thus, these two statements are equal:
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<br \><br \>
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<div class='sql'>
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<pre>
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FROM C WHERE C.col1 <> ALL (FROM C2(col1));
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FROM C WHERE C.col1 NOT IN (FROM C2(col1));
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</pre>
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</div>
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