Approach to Selecting top item matching a criteria

Posted by jkelley on Stack Overflow See other posts from Stack Overflow or by jkelley
Published on 2010-05-28T18:08:10Z Indexed on 2010/05/28 18:12 UTC
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I have a SQL problem that I've come up against routinely, and normally just solved w/ a nested query. I'm hoping someone can suggest a more elegant solution.

It often happens that I need to select a result set for a user, conditioned upon it being the most recent, or the most sizeable or whatever.

For example: Their complete list of pages created, but I only want the most recent name they applied to a page. It so happens that the database contains many entries for each page, and only the most recent one is desired.

I've been using a nested select like:

SELECT pg.customName, pg.id
FROM (
     select id, max(createdAt) as mostRecent
     from pages
     where userId = @UserId
     GROUP BY id
) as MostRecentPages
JOIN pages pg
ON pg.id = MostRecentPages.id
AND pg.createdAt = MostRecentPages.mostRecent

Is there a better syntax to perform this selection?

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