A better version (based heavily on http://data.stackexchange.com/serverfault/s/915/most-popular-xkcd-links). Now supports four-digit comic numbers!
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-- Improved XKCD Finder -- A better version SELECT SUBSTRING(C.Text, CHARINDEX('xkcd.com/', C.Text) + 9, 3 ) AS CommentComicNumber, 'http://xkcd.com/' + SUBSTRING(C.Text,CHARINDEX('xkcd.com/',C.Text) + 9,3), count(*) AS CommentCount FROM Comments as C WHERE C.Text like '%xkcd.com/%' GROUP BY SUBSTRING(C.Text, CHARINDEX('xkcd.com/', C.Text) + 9, 3 ) ORDER BY count(*) DESC;