Create and delete users in mysql database

Step 1: Enter MySQL

mysql -uroot msyql -p Enter the password of the root user (specified by yourself when installing mysql)

 

Create a test user, the password is test, "%" means that all users in the network can access the database with the test user name (all tables in all databases);

grant all on *.* to 'test'@'%' identified by 'test';

and comment the bind-address line in /etc/mysql/mysql.cnf

 

To access all tables in a_db, use the following statement

grant all on a_db.*  to 'test'@'%' identified by 'test';

 

Restrict permissions, restrict the test user to only query all tables in a_db

grant select on a_db.* to 'test'@'%' identified by 'test';

 

View all database users in mysql

select distinct concat('User: ''',user,'''@''',host,''';') as query from mysql.user;

User authorization to be created;

GRANT ALL PRIVILEGES ON `test`.* TO 'test'@'%' ;

delete test user

delete from user where User='test' and Host='%';

flush privileges;

 

 

enter user

    mysql> use username

 

Display the current operating user

    mysql>  show database();

或SELECT database();

. Realize
    mysql> show tables through show tables;
    Note: Pay attention to check the column header form, the format is: Tables_in_[db_name]

. Realize
    mysql> status through status;

 

View the user table and enter the user as mysql;