MySql LIKE

mysql> create table test (dummy varchar(16) not null);
Query OK, 0 rows affected (0.10 sec)

mysql> insert into test(dummy) values ('!exclamation');
Query OK, 1 row affected (0.06 sec)

mysql> select dummy from test where dummy like '%!!%' escape '!';
+--------------+
| dummy        |
+--------------+
| !exclamation |
+--------------+
1 row in set (0.00 sec)

It should work ...

Over 1 million usernames and this query gives 0 result:

Code:

SELECT *
FROM `pvp_map`
WHERE `Name` LIKE '%!!%' ESCAPE '!'
GROUP BY `Player_Id`, `Name`
ORDER BY `Name`

I really don't know where the problem is.