mysql database to create user and authorization

　　Create a user and password CREATE USER 'username' @ '%' IDENTIFIED BY 'password';

　　create several databases such as db1, db2

　　users authorized to access the specified database
　　grant all privileges on the database name * to 'username' @ '%. ';

　　change the current user password
　　set password for the account = password (' target password ');

　　delete user
　　drop user username @'% ';

 

Reference Source: https://blog.csdn.net/qq_39331713/article/details/81747188

                  https://www.cnblogs.com/wuyunblog/p/9109269.html

                  https://www.cnblogs.com/xjnotxj/p/6916509.html