将表更新为另一个表的最后一个ID

Question

I want to run something like

 UPDATE TABLE profile
 SET profile_photo = (SELECT photo_id FROM photos WHERE profile_id 
 = 'someprofileid' ORDER BY photo_id DESC LIMIT 1;)
 WHERE 'somecolumn' = 'some criteria'

I have seen Advanced MySql Query: Update table with info from another table

But I only want the last entry which satisfies the WHERE clause, therefore the DESC and LIMIT 1 . How do I included these criteria in the SET information?

(My goal is to update change a profile picture to the most recent profile picture, after eg a delete or sth)

Answer 1

使用带有limit和desc的select查询并获取ID并对该ID进行简单的更新

Answer 2

update supports order by and limit :

 UPDATE TABLE profile p
     SET profile_photo = (SELECT photo_id
                          FROM photos ph
                          WHERE ph.profile_id = 'someprofileid'
                          ORDER BY photo_id DESC
                          LIMIT 1
                         )
     WHERE p.'somecolumn' = 'some criteria'
     ORDER BY p.id DESC   -- you need to order by something
     LIMIT 1;