play mysql on mac

1. install
   google instal mysql community mac
2. start server
   cd /usr/local/mysql-8.0.25-macos11-x86_64/support-files
   sudo ./mysql.server start
   sudo killall mysqld
   cd /usr/local
   sudo chown -R mysql mysql-8.0.25-macos11-x86_64
   cd mysql-8.0.25-macos11/support-files
   sudo ./mysql.server start
3. log in
   cd /usr/local/mysql-8.0.25-macos11-x86_64/bin
   ./mysql -u root -p
4. log out
   mysql> exit
5. list databases
   mysql> show databases;
6. create database
   mysql> create database test_db;
7. change/switch database
   mysql> use test_db;
8. list tables
   mysql> show tables;
9. create user
   -- login as root user
   mysql> create user 'test'@'localhost' identified by 'test0';
10. grant privileges to user
    mysql> grant all privileges on test_db.* to 'test'@'localhost';
    mysql> flush privileges;
    mysql> exit;
    ./mysql -u test -p
    mysql> show databases; -- should be able to see test_db but not sys