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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:
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.
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
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
How can I SELECT rows with MAX(Column value), DISTINCT by , Select BOTH the home and its max date time, then join back to the top table on BOTH the fields: Want to learn SQL from basics! Here's the right� Select Rows with Maximum Value on a Column Example 2. In this example, we will show how to select rows with max value along with remaining columns. It is useful if you want to return the remaining columns (non-group by columns). For this SQL Server example, we used the Inner Join to join the employee table with itself.
SQL MAX command: MySQL on Maximum or highest value in a field, MAX sql command will return the record with maximum or highest value in the SQL table. We can get matching output of id, name,class by using where clause by matching with i have tried to be in inner join Based,Find Max Value SELECT s.id, s.first, s.last, sd.school_year, sd.gpa FROM Student s . LEFT OUTER JOIN StudentGrades sd ON s.id=sd.student_id. Sixteen student grade records will be returned by using only a LEFT OUTER JOIN in the query. Altering the query to include a subquery with MAX on record id, results with student latest GPA data.
Examples with Multiple table left join using group by , max ,avg,order , SQL left join query examples using multiple tables. SELECT id,name,class,sex, student_id,mark FROM `student6` a LEFT JOIN (SELECT student_id, We will display list in the order of average value from maximum to minimum and then use LIMIT query to get first record. SELECT Joining the table to itself by inner join This will get all results from table 1 where they appear in table 2, and get the highest ID of that result, and display the data! SELECT * FROM table1 INNER JOIN ( SELECT MAX (table1.id) AS id FROM table1 INNER JOIN table2 ON table2.client = table1.client AND table2.campaign=table1.campaign AND table2.enabled != 'disabled' GROUP BY table1.client, table1.campaign ) AS m ON m.id = table1.id.
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- 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
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.