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/*
mysql> /*
mysql> NULL means a missing unknown value
mysql> is treated somewhat differently than other values.
mysql> */
mysql> SELECT 1 = NULL, 1 <> NULL, 1 < NULL, 1 > NULL;
+----------+-----------+----------+----------+
| 1 = NULL | 1 <> NULL | 1 < NULL | 1 > NULL |
+----------+-----------+----------+----------+
| NULL | NULL | NULL | NULL |
+----------+-----------+----------+----------+
1 row in set (0.00 sec)
*/
/*
NULL means a missing unknown value
is treated somewhat differently than other values.
*/
SELECT 1 = NULL, 1 <> NULL, 1 < NULL, 1 > NULL;
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