Question

I’m trying to fetch last messages from database and group them by users

https://i.stack.imgur.com/Wjzin4.png

$query = $this->query("SELECT * FROM `messages` 
WHERE `receiver` = '763' 
GROUP BY `sender` 
ORDER BY `id` DESC 
LIMIT 0, 50");

Output:

https://i.stack.imgur.com/GLhyan.png

so there’s the problem.. supposed to be e instead of d and c instead of a

Answer 1

SELECT  a.*
FROM    messages a
        INNER JOIN
        (
            SELECT  sender, MAX(ID) MAX_ID
            FROM    messages
            GROUP   BY sender
        ) b ON a.sender = b.sender AND
                a.id = b.MAX_ID
// WHERE clause...
// ORDER BY ....
// LIMIT  .....

SQLFiddle Demo Link