This might help.
http://www.mysql.com/doc/en/example-Maximum-column-group-row.html
I had the same problem. Before I found the webpage above, I went with a less
efficient but simpler way. I wanted the highest revision ("revision") for each news
article ("id").
$SQL = "CREATE TEMPORARY TABLE news_temp SELECT * FROM news ORDER BY revision DESC;";
$db->Execute($SQL);
// at this point, the results are in the temporary table,
// ordered JUST the way we like them :) Now to pick
// out the top one for each news id.
$SQL = "SELECT * FROM news_temp GROUP BY id ORDER BY id DESC;";
$result = $db->Execute($SQL);
Something like this might be what you're looking for. I don't understand exactly how
you want to order/choose students, but you might just need order by firm rank first,
then time rank.
I hope that's of use.
-The Mindflayer
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