Hmm, not too sure which db you using assuming you are using mySQL, you can the following commands:
SELECT *, count(*) cnt FROM tableName GROUP BY fieldname1, fieldname2, .... HAVING cnt > 1
It will than return duplicates or entries with more than 1
If you using msSQL, you can read thier kb about this:
http://support.microsoft.com/default...b;en-us;139444
I also found this on softpedia, though personally I never use it before
http://www.softpedia.com/get/Interne...Software.shtml