DEDECMS 批量替换alt为空的文章为文章标题的MYSQL语句

update dede_addonarticle,dede_archives set dede_addonarticle.body=replace(dede_addonarticle.body, "alt=""", concat('alt="', dede_archives.title)) where INSTR(body,"alt=""")>0 and dede_archives.id=dede_addonarticle.aid