MySQL常用命令记录

创建数据库

create database test DEFAULT CHARSET utf8 COLLATE utf8_general_ci;  

添加用户

create user 'cjh'@'%' identified by '123456';

用户授权

grant all privileges on `testdb`.* to 'test'@'%' identified by '123456';

flush privileges;  

密码安全策略

mysql> SHOW VARIABLES LIKE 'validate_password%';

validate_password_policy有以下取值：

Policy	Tests Performed
0 or LOW	Length
1 or MEDIUM	Length; numeric, lowercase/uppercase, and special characters
2 or STRONG	Length; numeric, lowercase/uppercase, and special characters; dictionary file

默认是1，即MEDIUM，所以刚开始设置的密码必须符合长度，且必须含有数字，小写或大写字母，特殊字符。

设置成你想要的安全策略

set global validate_password_length=0；

设置密码

SET PASSWORD FOR 'root'@'localhost' = PASSWORD('newpass');

删除外键冲突的记录

DELETE e.*
FROM
 yl_cloud_std_demo.role_menu e
WHERE
 id IN (
  SELECT
   t.id
  FROM
   (
    SELECT
     a.id
    FROM
     yl_cloud_std_demo.role_menu a
    LEFT JOIN yl_common.menu b ON a.menu_code = b.menu_code
    WHERE
     b.menu_code IS NULL
   ) t
 )

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