MySQL8.0创建用户与赋予用户权限

异常一

报错语句：

grant select,update,delete,insert on test.* to ‘tom’@‘localhost’ identified by ‘abc123’;

异常信息：

ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ‘identified by ‘abc123’’ at line 1

原因：
mysql8.0中已经不支持这种写法了，赋予权限必须分开，先创建用户、再给用户赋值

解决办法：
去掉identified by ‘abc123’

异常二

先创建用户tom：
create user tom identified by ‘abc123’；

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报错语句：

grant select,update,delete,insert on test.* to ‘tom’@‘localhost’;

异常信息：

ERROR 1410 (42000): You are not allowed to create a user with GRANT

原因：
默认创建用户的主机是 '%'即任意主机

MySQL中查询用户主机：

SELECT HOST,USER FROM mysql.user;

解决办法：
如果想修改为 'localhost’输入以下语句：

UPDATE mysql.user SET HOST=‘localhost’ WHERE USER=‘tom’;

正确语句

GRANT SELECT,UPDATE,DELETE,INSERT ON test.* TO ‘tom’@’%’;