ERROR 1044 (42000): Access denied for user ''@'localhost' to database 'mysql

[root@localhost mysql]# mysql -u root -p
Enter password:
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 8 to server version: 5.0.22-standard

Type 'help;' or '\h' for help. Type '\c' to clear the buffer.

mysql> show databases;
+--------------------+
| Database |
+--------------------+
| information_schema |
| test |
+--------------------+
2 rows in set (0.00 sec)
mysql> create database njepga;
ERROR 1044 (42000): Access denied for user ''@'localhost' to database 'njepga'
mysql>

ERROR错误 application error script error 魔兽error internal error NSIS Error Runtime Error~~~ hard error Runtime Error! Fatal error