(mysql) 설치 및 DB생성, 사용자 생성, 사용자 권한 부여

1. mysql 설치(인터넷 or brew install mysql)
2. d
   1. mysql.server start
   2. sudo mysql -u 'user_id'; //(root)
   3. create database 'db_name';
   4. show databases;
   5. create user 'user_name'@'ip' identified by 'user_pw'; //(ip = %)
   6. grant 'privilege_name' on 'db_name'.'table_name' to 'user_name'@'ip'; //(all privileges, db.*)
   7. select host, user,password from mysql.user;
   8. select host, user,authentication_string from mysql.user;