Question

I have 2 tables Thread and Posts, i would like to search my posts and order by thread with most matches.

Right now i have this:

SELECT Threads.* 
FROM Posts 
INNER JOIN Threads ON Posts.ThreadID=Threads.ThreadID 
WHERE Posts.Content LIKE '%" . $search .  "%' 
     OR Posts.User LIKE '%" . $search ."%'

Answer 1

You could add a join to calculate the number of posts per thread. Since you’re not selecting any columns from Posts, that’s the only join you’ll need.

select  t.* 
from    Threads t
join    (
        select  ThreadID
        ,       count(*) as PostCount
        from    Posts
        where   p.Content LIKE '%" . $search .  "%' 
                or p.User LIKE '%" . $search ."%'
        group by
                ThreadID
        ) PostCount
on      PostCount.ThreadID = t.ThreadID
order by
        PostCount.PostCount desc