session 에러

select count(id) as cnt from where ss_datetime < '2011-01-14 17:48:29'

1064 : 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 'where ss_datetime < '2011-01-14 17:48:29'' at line 1

error file : /adm/session_delete.php

세션 정리 하려니 하단에 이런에러가 발생하는데 뭐가문제일까요