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isnull

ISNULL

Description​

Checks whether the value is NULL, returns 1 if it is NULL, and returns 0 if it is not NULL.

Syntax​

ISNULL(v)

Parameters​

  • v: the value to check. All date types is supported.

Return value​

Returns 1 if it is NULL, and returns 0 if it is not NULL.

Example​

MYSQL > SELECT c1, isnull(c1) FROM t1;
+------+--------------+
| c1   | `c1` IS NULL |
+------+--------------+
| NULL |            1 |
|    1 |            0 |
+------+--------------+