Question

So I have two tables for dealing with messages threads and messages.

messages:
id | thread | user_from | user_to | text | created

threads:
id | user_from | user_to | created | status

I want to build a query that would fetch me threads with:

1. the latest message for that thread
2. the id for that thread

Until now, I have been dealing with this problem by first fetching the all threads (with proper limits of course) and then getting the latest message for each thread individually.

Any thoughts?

Update:

Table Relation: messages.thread = threads.id

Answer 1

Off the top of my head:

SELECT t.id, m.* FROM threads t
INNER JOIN messages m ON m.thread = t.id
WHERE m.id = 
   (SELECT id FROM messages WHERE thread = t.id ORDER BY id DESC LIMIT 1);

[edit] Tested and it seems to work fine.