選擇在同一時間更新所有行

Question

我正在嘗試更新並選擇與以下相同的表：

UPDATE tbl_domain SET remain = 
(SELECT DATEDIFF(expdate,NOW()) FROM (
SELECT DATEDIFF(expdate,NOW()) FROM tbl_domain 
) as x )  

我該如何運作？ 有人請幫助我！

Answer 1

嘗試這個：

UPDATE tbl_domain t, (SELECT DATEDIFF(expdate,NOW()) as remain
                        FROM tbl_domain 
                       ) t1
SET t.remain = t1.remain
-- WHERE t.Id = t1.Id --If you have some kind of unique id in your table.