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C # tutorial
Check whether the expression is a Null value
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.
IsNull(expression)
| Parameter | Description |
|---|---|
| expression | Required. The value to test |
| Works in: | From Access 2000 |
|---|
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);