WTF mysql

gistfile1.txt

mysql> desc card_commissions;

+------------+--------------+------+-----+---------+----------------+
| Field      | Type         | Null | Key | Default | Extra          |
+------------+--------------+------+-----+---------+----------------+
| id         | int(11)      | NO   | PRI | NULL    | auto_increment |
| unique_id  | varchar(255) | YES  | MUL | NULL    |                |
| year_month | int(11)      | YES  |     | NULL    |                |
| value      | decimal(8,2) | YES  |     | NULL    |                |
| created_at | datetime     | YES  |     | NULL    |                |
| updated_at | datetime     | YES  |     | NULL    |                |
+------------+--------------+------+-----+---------+----------------+
6 rows in set (0.00 sec)

mysql> select id from card_commissions limit 1;
+----+
| id |
+----+
|  1 |
+----+
1 row in set (0.00 sec)

mysql> select year_month from card_commissions limit 1;
ERROR 1064 (42000): You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'year_month from card_commissions limit 1' at line 1