Result = IsBoolean ( vExpression ) AS Boolean Result = Boolean? ( vExpression ) AS Boolean
Returns TRUE if the vExpression is Boolean.
PRINT IsBoolean(FALSE), IsBoolean((1 > 0) AND (2 > 1)), IsBoolean(IsBoolean("no matter what")) <hr>True True True
PRINT IsBoolean(-1), IsBoolean(NULL) <hr>False False