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I got two tables, conversations and messages, What I'd like to do is to make a inner join from conversations to messages.

Here is my query:

    SELECT 
    messages.msg,
    messages.`read`,
    conversations.userid,
    conversations.contactid

    FROM conversations 
        INNER JOIN messages ON 
        conversations.id = messages.convId
    WHERE conversations.id IN(443,444)

Now everything works as it should, but a last thing is that in the inner join where i use

conversations.id = messages.convId

I would like to get the highest ids only, like:

 AND MAX(messages.id)

But that doesn't work

EDIT: I tried once to use:

LEFT JOIN messages 
    ON conversations.id = messages.convId 
        AND messages.id = MAX(messages.id) 

But i got an error saying: Invalid use of group function.

EDIT

This will work!

SELECT conversations.*, m1.* 
FROM conversations 
LEFT JOIN messages m1
    ON conversations.id = m1.cid 
    AND m1.id = (
            SELECT MAX(m2.id) 
            FROM messages m2 
            WHERE m2.cid = conversations.id
        )

how to innerjoin with max id in another table, Hide Copy Code. select employee.*,employeestatus.* from employee with ( nolock) inner join ( select max([status]) as [status],empid from� Now everything works as it should, but a last thing is that in the inner join where i use. conversations.id = messages.convId I would like to get the highest ids only, like: AND MAX(messages.id) But that doesn’t work . EDIT: I tried once to use: LEFT JOIN messages ON conversations.id = messages.convId AND messages.id = MAX(messages.id)

You are looking for the maximum value in a group. MySQL does not have any really obvious way to do this (lots of ways with a bit of trickery).

But, you are only looking for two groups. As such, you can just look for the limit in each group and combine them using union all:

SELECT m.msg, m.`read`, c.userid,
       c.contactid
FROM conversations c inner join
     ((select m.*
       from messages m
       where m.convid = 443
       order by m.id desc
       limit 1
      ) union all
      (select m.*
       from messages m
       where m.convid = 444
       order by m.id desc
       limit 1
      )
     ) m
     ON c.id = m.convId;

If you have indexes on messages(convid, id) and conversations(id), then this should be quite fast.

You can also do this using a more standard approach:

SELECT m.msg, m.`read`, c.userid,
       c.contactid
FROM conversations c inner join
     messages m
     ON c.id = m.convId
where c.convId in (443, 444) and
      m.id = (select max(id) from messages m2 where m2.convId = c.convId)

how to select top ID from join operation and staging tables , However, if you are looking to extract the max over a grouping, and you can define that grouping, and you want to obtain the 'column-wise' maximum for more � And I'm looking for a query to get the level for each user. Something along the lines of: SELECT * FROM Users U INNER JOIN ( SELECT TOP 1 Level, U.UserName FROM Levels L WHERE L.MinPoints < U.Points ORDER BY MinPoints DESC ) UL ON U.Username = UL.Username Such that the results would be:

the top solution above will not work everywhere, for example postgres will give errors, a better solution to join tables and only get the max id from the other table:

SELECT conversations.*, m.* 
    FROM conversations 
    JOIN (SELECT cid, max(id) as m_id from messages group by cid) as m
        ON conversations.id = m.cid 

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Comments
  • You can order your messages by id : ORDER BY conversations.id ASC, messages.id DESC
  • that will give me only one row, i'd like a row per convId
  • No, it will give multiple rows. But my mistake, I should have written ORDER BY conversations.id ASC, messages.id DESC GROUP BY conversations.id
  • actually this will not work, cuz it limits to only 1 row, i want a row per conversations.id where it is the highest id in messags.convId
  • So you only want to retrieve the latest message for each conversation?
  • I have updated my answer. I have used the MAX() function, and changed it from an INNER JOIN to LEFT JOIN, so your conversations are returned, even if there aren't any messages. AND MAX(messages.id) on its own won't work, however it should work if you compare it to the messages.id field: AND messages.id = MAX(messages.id)
  • @PhilCross - that is completely legitimate, assuming that is what Kilise wants.
  • An inner join will only return conversations and messages of the is at least one message for the conversation. A left join will return all the requested conversations, even if there isn't any messages for them. A right join would return all the messages even if there aren't any conversations for them.