ELECT * FROM cms_user WHERE age IS NULL; +----+----------+----------+-------------+------------+----------+-------+------+ | id | username | password | email | regTime | face | proId | age | +----+----------+----------+-------------+------------+----------+-------+------+ | 12 | test1 | test1 | user@qq.com | 1419811708 | user.jpg | 1 | NULL | +----+----------+----------+-------------+------------+----------+-------+------+ 1 row in set (0.00 sec) IS NOT NULL mysql> SELECT * FROM cms_user WHERE age IS NOT NULL;
mysql <=> null 问题
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