A fatal MySQL error occurred.

Query:
SELECT *,CONCAT('http://www.classifiedclue.com/page.php?id=',id) as friendly_url_full FROM pmd_pages WHERE id=why-advertise-on-classified-clue

Error:
(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 'on-classified-clue' at line 1