SELECT SUBSTRING_INDEX(download_url, '?', 1) FROM `t_download_information` ;
UPDATE `t_download_information` SET `download_url`= SUBSTRING_INDEX(download_url, '?', 1);
SELECT SUBSTRING_INDEX(download_url, '?', 1) FROM `t_download_information` ;
UPDATE `t_download_information` SET `download_url`= SUBSTRING_INDEX(download_url, '?', 1);