Question

I am creating private message system in php/mysql.

I created message tables:

messages(message_id|sender_id|receiver_id|message_text|created_time)

Here is data in table

message_id|sender_id||receiver_id|message_text|   created_time
   1         101          102       Message A    2012-06-07 08:07:18
   2         101          102       Message B    2012-06-07 08:10:20
   3         103          102       Message C    2012-06-07 08:12:43

The output I want is:

     sender_id|message_text |   created_time
       101      Message B     2012-06-07 08:10:20
       103      Message C     2012-06-07 08:12:43

Something like:

SELECT sender_id,message_text,created_time from messages
WHERE receiver_id='102'
GROUP BY sender_id
ORDERBY BY created_time

I want to show the last message of any user.

Answer 1

SELECT sender_id, MESSAGE_TEXT, created_time
FROM messages
WHERE receiver_id = 102
  AND created_time IN
    (SELECT MAX(created_time)
     FROM messages
     GROUP BY sender_id);

Demo