$table = <<< __EOF__
            dtb_products AS T1
            LEFT JOIN (
                SELECT product_id AS product_id_sub,
ここに（ product_class_id, ）追加
                    product_code,
                    price01,
                    price02,
                    deliv_fee,
                    stock,
                    stock_unlimited,
                    weight,
                    sale_limit,
                    point_rate,
                    product_type_id,
                    down_filename,
                    down_realfilename
                FROM dtb_products_class
            ) AS T2
                ON T1.product_id = T2.product_id_sub
__EOF__;