note dragonchild While I can't offer any better solutions (because I haven't really spent any time thinking on the problem), it might help to know <i>why</i> you're having issues. In relational theory, a SELECT statement is a view transformation on each row in the resulting (often temporary) table from the JOIN clause (modified by the GROUP BY clause). The WHERE clause is a limiter on that table. Given that you want to do a transformation crossing rows, that's where your problem is. Essentially, you need to create a table where the column you're interested in appears twice in each row so that your SELECT function can work on a given row. <!-- Node text goes above. Div tags should contain sig only --> <div class="pmsig"><div class="pmsig-85580"> <hr> My criteria for good software: <ol> <li>Does it work? <li>Can someone else come in, make a change, and be reasonably certain no bugs were introduced? </ol> </div></div> 723592 723592