MySQL Error : sql query "SELECT `Id`, `Title`, `Year`, `Score`, `IMDB_rating`, `Comments`,1 FROM `dvd` WHERE `Year` = '1979' ORDER BY Comments DESC LIMIT -20,25;" generates an 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 '-20,25' at line 1"