select last message of conversation for each conversation in mysql

Question

my query:

SELECT *
  FROM messages_status mst
       INNER JOIN messages msg 
             ON mst.msg_id=msg.id
 WHERE mst.user_id = 1 
       AND mst.status         


        

Answer 1

SQLFIDDLEExample

Query:

SELECT msg.*
FROM messages_status mst
INNER JOIN messages msg ON mst.msg_id=msg.id
LEFT JOIN messages ms2
 ON ms2.conv_id = msg.conv_id
 AND ms2.created_at > msg.created_at
WHERE mst.user_id = 1 
 AND mst.status NOT IN (0,3)
 AND ms2.created_at is null

Result:

| ID | SENDER_ID | CONV_ID |       CONTENT |                   CREATED_AT |                   UPDATED_AT |
|----|-----------|---------|---------------|------------------------------|------------------------------|
| 16 |         3 |       3 |         hy :) | March, 26 2014 16:38:17+0000 | March, 26 2014 16:38:17+0000 |
| 14 |         1 |       1 | kjhkjhkjh  kl | March, 26 2014 16:16:25+0000 | March, 26 2014 16:16:25+0000 |