[root@db1 ~]# mysql -uroot -pfoobar
Welcome to the MySQL monitor.  Commands end with ; or \g.
Your MySQL connection id is 3
Server version: 5.1.61 Source distribution

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owners.

Type 'help;' or '\h' for help. Type '\c' to clear the current input statement.

mysql> use mysql
Reading table information for completion of table and column names
You can turn off this feature to get a quicker startup with -A

Database changed
mysql> select User from user;
+------+
| User |
+------+
| root |
|      |
| root |
|      |
| root |
+------+
5 rows in set (0.00 sec)

mysql> CREATE USER '123'@'%' IDENTIFIED BY '123';
Query OK, 0 rows affected (0.00 sec)

mysql> show databases;
+--------------------+
| Database           |
+--------------------+
| information_schema |
| mysql              |
| test               |
+--------------------+
3 rows in set (0.00 sec)

mysql> create database 123;
Query OK, 1 row affected (0.00 sec)

mysql> GRANT ALL ON 123.* to '123'@'%' WITH GRANT OPTION;
Query OK, 0 rows affected (0.00 sec)

mysql> FLUSH PRIVILEGES;
Query OK, 0 rows affected (0.00 sec)

mysql> quit
Bye
[root@db1 ~]# mysql -u123 -p123
ERROR 1045 (28000): Access denied for user '123'@'localhost' (using password: YES)

mysql> use mysql
Database changed

mysql> select * from user where User='123' \G
*************************** 1. row ***************************
                 Host: %
                 User: 123
             Password: *08FA77CAB469297F05D9CA01BAA5529DDBC5265B
          Select_priv: N
          Insert_priv: N
          Update_priv: N
          Delete_priv: N
          Create_priv: N
            Drop_priv: N
          Reload_priv: N
        Shutdown_priv: N
         Process_priv: N
            File_priv: N
           Grant_priv: N
      References_priv: N
           Index_priv: N
           Alter_priv: N
         Show_db_priv: N
           Super_priv: N
Create_tmp_table_priv: N
     Lock_tables_priv: N
         Execute_priv: N
      Repl_slave_priv: N
     Repl_client_priv: N
     Create_view_priv: N
       Show_view_priv: N
  Create_routine_priv: N
   Alter_routine_priv: N
     Create_user_priv: N
           Event_priv: N
         Trigger_priv: N
             ssl_type:
           ssl_cipher:
          x509_issuer:
         x509_subject:
        max_questions: 0
          max_updates: 0
      max_connections: 0
 max_user_connections: 0
1 row in set (0.00 sec)