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 'and files.file_path = 'pages/bg_img'' at line 5
Query is:

            SELECT * FROM 
	            pages 
            LEFT JOIN pages_files pf ON pf.page_id = pages.page_id
            LEFT JOIN files on files.file_id = pf.file_id
            WHERE pages.page_id =  and files.file_path = 'pages/bg_img'