mysql如何查看用户及其权限

【1】查看mysql数据库中的所有用户

SELECT DISTINCT CONCAT('User: ''',user,'''@''',host,''';') AS query FROM mysql.user; 

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【2】查看某个用户的权限

show grants for 'nextcloud'@'%'; 

or

select * from mysql.user where user='root' \G; 

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【3】查看当前用户

select user();

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【4】修改用户密码

use mysql;
UPDATE user SET password=PASSWORD('新密码') WHERE user='用户';
flush privileges;

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【5】修改用户权限及密码

grant 权限 on 库名.表名 to '用户名'@’网段‘  identified by  "该用户的密码"；

grant all privileges on nextcloud.* to 'nextcloud'@'%' identified by 'du..olctx..entest.1';

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【6】删除用户

drop user 'nextcloud'@'%';

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【7】补充

mysql数据库授权链接如下:
https://blog.csdn.net/GX_1_11_real/article/details/81200566