Errors : select file_id,cate_file_id,file_title,file_name,file_source,date_save,ifnull(download_times,1) from tb_grouppage_file_download where 1=1 and cate_file_id = 'C00028' order by file_id desc limit -50,50

MSG: You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near '-50,50' at line 2