ISNULL

Returns true if the value is NULL.

Syntax

ISNULL (val)
(val IS NULL)

Arguments

  • val: any object

Return Type

Boolean

Examples

SELECT ISNULL(NULL), ISNULL(0), (NULL + 0 is NULL), (0 is NULL);
+--------------+-----------+--------------------+-------------+
| ISNULL(NULL) | ISNULL(0) | (NULL + 0 is NULL) | (0 is NULL) |
+--------------+-----------+--------------------+-------------+
|            1 |         0 |                  1 |           0 |
+--------------+-----------+--------------------+-------------+