Question

The following MySQL query returns a result set with just over a million rows:

SELECT postid
FROM post p
JOIN thread t ON p.threadid = t.threadid
WHERE t.forumid = 10
AND t.visible = 1
AND p.visible = 1
ORDER BY p.dateline desc

Which is nice, however I want to get the row at the millionth position.

So the question is, if you haven’t guessed already, how do I go about doing this

NOTE : This table is actively being used, so new rows are added all the time.

EDIT : That question isn’t entirely clear, the query returns a list of all posts in a specific forum order by post date desc, so it isn’t so much the millionth post in the result set rather the millionth post on the forum.

Answer 1

You can use the LIMIT clause which accepts a zero-based record index followed by a record count.

Therefore for a single record at the millionth row, you could use:

SELECT postid
FROM post p
JOIN thread t ON p.threadid = t.threadid
WHERE t.forumid = 10
AND t.visible = 1
AND p.visible = 1
ORDER BY p.dateline desc
LIMIT 999999,1