mysql用root賬戶建立用戶和賦予權限

1.創建用戶

create user guest_test@localhost identified by "root";
-- 創建名為guest_test的用戶

2.賦予權限

-- 給guest_test用戶賦予guest_test增刪改的權限。第一個guest_test指數據庫，第二個指用戶名，hostname指指定ip

grant create,alter,drop on guest_test.* to guest_test@localhost

-- 給guest_test用戶賦予guest_test庫中所有表的全部權限
grant all privileges on *.* to guest_test@localhost

-- 給guest_test用戶賦予guest_test庫中所有表的查詢權限
grant select on database.* to guest_test@localhost

-- 給guest_test用戶賦予guest_test某個表的用戶權限
grant select on guest_test.t1table to guest_test@localhost

3.撤銷權限

撤銷guest_test用戶guest_test庫所有表的增刪改查的權限

revoke select,update,delete,insert on guest_test.* from guest_test@localhost;
flush privileges;

4.刪除用戶

drop user guest_test@localhost

5.在數據庫中查詢所有用戶

SELECT * FROM mysql.user;