Mysql中NULL详解mysql null值处理详细说明
mysql null值处理详细说明在讲null之前，我们先看一个例子表数据如下：3306>select * from t1;+------+-------+| id | name |+------+-------+| 1 | chen || 2 | zhang || 3 | NULL |+------+-------+3 rows in set (...
