John:
A couple of suggestions. First, a better way to identify duplicate files in to use MD5 sum - MySQL can compute it with MD5(LOAD_FILE(fname)) if the file is residing on the server. It would be a good idea to store the md5 sum in the table.
I think your problem can be solved with
CREATE TEMPORARY TABLE t1 (<put select fields here>,UNIQUE KEY(size))
then
INSERT IGNORE INTO t1 SELECT ... ORDER BY size,if(ServerName='primary_server',0,1)
and then
SELECT * FROM t1
DROP TABLE t1
A little convoluted, but nothing better really comes to my mind at this point.
-- Sasha Pachev Create online surveys at http://www.surveyz.com/
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