Home/ Questions/Q 3398068
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-18T04:36:17+00:00

I was trying to achieve this query1 : UPDATE temp_svn1 t set closedate=(select max(date)

  • 0

I was trying to achieve this query1:

UPDATE temp_svn1 t set closedate=(select max(date) from temp_svn1 p where p.id=t.id

Apparently MySQL does not allow such queries. So I came up with this query using inner joins but this is too slow. How can I write a better query for this? OR How can I achieve the logic of query 1?

UPDATE temp_svn1 AS out INNER JOIN (select id, close from temp_svn1 T inner join (select id as cat, max(date) as close from temp_svn1 group by cat) as in where T.id = in.cat group by id ) as result ON out.id = result.id SET out.closedate = result.close

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    Because of mysql peculiarities the only way you’re going to get this to be faster is to split it into two statements. First, fetch the max, and then use it in an update. This is a known hack, and, afaik, there’s not a “neater” way of doing it in a single statement.

    • 0