Select the Latest Message Between the communication of two user in mysql

Question

I have a simple table maintaining messages between users. The table structure looks like

     sender    receiver   message   sendtime
      1          2              


        

Answer 1

I take 30 mins to find the solution for this problem because I have thew same problem just take it simple

SELECT DISTINCT sent_by FROM messages WHERE sent_to = 1 UNION SELECT DISTINCT sent_to FROM messages WHERE sent_by = 1