Data Type MySQL

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  4. NULL is basically a third possible result of an evaluation
mysql>
mysql> SELECT 200 = NULL, 200 <> NULL, 200 < NULL, 200 > NULL;
+------------+-------------+------------+------------+
| 200 = NULL | 200 <> NULL | 200 < NULL | 200 > NULL |
+------------+-------------+------------+------------+
|       NULL |        NULL |       NULL |       NULL |
+------------+-------------+------------+------------+
1 row in set (0.00 sec)
mysql>
mysql>