SELECT UPDATE ALL ROWS AT THE SAME TIME MYSQL

Question

I'm trying to update and select the same table as the following:

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

How can i make it work ? Someone please help me!!!

Answer 1

Try this:

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.