php - Mysql query strange fail -

this query giving me error when add key column, help?

username , product composite primary key, in case.

mysql> select * sw_product_session username='admin'; +----------+----------+------------+----------------------------+ | username | product  | expire     | key                        | +----------+----------+------------+----------------------------+ | admin    | printbox | 1373550885 | 2ijm77cpnfc7miktasopkik2q2 | +----------+----------+------------+----------------------------+ 1 row in set (0.00 sec)  mysql> select * sw_product_session username='admin' , product='printbox'; +----------+----------+------------+----------------------------+ | username | product  | expire     | key                        | +----------+----------+------------+----------------------------+ | admin    | printbox | 1373550885 | 2ijm77cpnfc7miktasopkik2q2 | +----------+----------+------------+----------------------------+ 1 row in set (0.00 sec)  mysql> select * sw_product_session username='admin' , product='printbox' , key='2ijm77cpnfc7miktasopkik2q2'; error 1064 (42000): have error in sql syntax; check manual corresponds mysql server version right syntax use near 'key='2ijm77cpnfc7miktasopkik2q2'' @ line 1 

you need remember reserved words need escaped:

and `key`='...'