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SELECT ISNULL(NULL), ISNULL(0), ISNULL(1)

mysql> mysql> mysql> SELECT ISNULL(NULL), ISNULL(0), ISNULL(1); +--------------+-----------+-----------+ | ISNULL(NULL) | ISNULL(0) | ISNULL(1) | +--------------+-----------+-----------+ |            1 |         0 |         0 | +--------------+-----------+-----------+ 1 row in set (0.00 sec)