1,修改1列 update student s, city c set s.city_name = c.name where s.city_code = c.code; 2,修改多个列 update a, b set a.title=b.title, a.name=b.name where a.id=b.id •子查询 updat...
mysql5.7版本: 方法1: 用SET PASSWORD命令 格式:mysql> set password for 用户名@localhost = password('新密码'); 例子:mysql> set password for root@localhost = password('123'...