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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>