update arc_ceshiyong2 set item_no=isnull(item_no,0)+1 where recid='2019072315075604892075992428' https://zhidao.baidu.com/question/577975320.html?qbl=relate_question_3word=sql%20null%2B1 update tableName set num=isnull(num,0) +
where recid='2019072315075604892075992428'
https://zhidao.baidu.com/question/577975320.html?qbl=relate_question_3&word=sql%20null%2B1
update tableName set num=isnull(num,0) + isnull(接收到的数,0) where id=XXX