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Check whether the expression is a Null value:
SELECT IsNull(null);The IsNull() function checks whether an expression contains Null (no data). This function returns a Boolean value. TRUE (-1) indicates that the expression is a Null value, and FALSE (0) indicates that the expression is not a Null value.
expression )
Required. The value to test
Return TRUE if the expression is a null value, otherwise FALSE:
SELECT IsNull("Hello");Return TRUE if the expression is a null value, otherwise FALSE:
SELECT IsNull(0);❮ MS Access Functions