I want to get last row in mysql using group by

Question

SELECT * FROM msg_messages m 
JOIN msg_status s on m.messageId = s.messageId 
JOIN msg_threads t ON t.threadId = m.threadId 
JOIN users u ON u.userId = s.userId 
WHERE t.threadId = 1 
GROUP BY u.userId ORDER BY `m`.`date` DESC 

this is the query which give me always first index of every record. but i want get latest index in each group.. i tried many ways but result is nothing. user:

Answer 1

TRY THIS CODE

SELECT * FROM msg_messages m 
JOIN msg_status s on m.messageId = s.messageId 
JOIN msg_threads t ON t.threadId = m.threadId 
JOIN users u ON u.userId = s.userId 
WHERE t.threadId = 1 
GROUP BY u.userId ORDER BY `m`.`date` DESC LIMIT 0,1

Answer 2

how about this:

SELECT * FROM msg_messages m 
JOIN msg_status s on m.messageId = s.messageId 
JOIN msg_threads t ON t.threadId = m.threadId 
JOIN users u ON u.userId = s.userId 
GROUP BY u.userId 
having max (`m`.`date`)
ORDER BY `m`.`date` DESC 

I revised my query from

having max (`t`.`threadId`)

to

having max (`m`.`date`)

Answer 3

you can use LIMIT 1 after DESC then you will get last record. example: DESC LIMIT 1;