mysql>
mysql> SELECT 1 IS NOT NULL, 0 IS NOT NULL, NULL IS NOT NULL;
+---------------+---------------+------------------+
| 1 IS NOT NULL | 0 IS NOT NULL | NULL IS NOT NULL |
+---------------+---------------+------------------+
| 1 | 1 | 0 |
+---------------+---------------+------------------+
1 row in set (0.00 sec)
mysql>