Question

I have something like this:

id   title   url            revision
-------------------------------------
1    blah    someurl        1
2    blah    someurl        2
3    other   someotherurl   1
4    other   someotherurl   2

So I have two revisions of two different entries. Is there a way, through SQL, to SELECT just the latest revision of the latest documents?

IE: The query would return rows 2 and 4 because they’re the latest revisions, and it would exclude selecting older revisions.

Answer 1

Use:

SELECT x.*
  FROM YOUR_TABLE x
  JOIN (SELECT t.title, 
               MAX(t.revision) AS max_rev
          FROM YOUR_TABLE t
      GROUP BY t.title) y ON y.title = x.title
                         AND y.max_rev = x.revision

Because MySQL doesn’t support analytic functions (ROW_NUMBER), this approach is flawed — if you have the same title, and more than one of those has the same lowest revision, all of those with that lowest revision for that title will be displayed.