[ERROR]MySQL server version

[T4ke0veR]

[ERROR] Query: SELECT * FROM subcategoria WHERE id_cat = ORDER BY nombre ASC, error: echo ; 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 'ORDER BY nombre ASC' at line 1
esto es lo q me devuelve...
ahora... id_sub es = al id_cat q viene del url...