SQL query to find duplicate rows, in any table

Question

I\'m looking for a schema-independent query. That is, if I have a users table or a purchases table, the query should be equally capable of catchin

Answer 1

I have done this using CTEs in SQL Server.

Here is a sample on how to delete dupes but you should be able to adapt it easily to find dupes:

WITH CTE (COl1, Col2, DuplicateCount)
AS
(
    SELECT COl1,Col2,
    ROW_NUMBER() OVER(PARTITION BY COl1,Col2 ORDER BY Col1) AS DuplicateCount
    FROM DuplicateRcordTable
)
DELETE
FROM CTE
WHERE DuplicateCount > 1
GO

Here is a link to an article where I got the SQL:

http://blog.sqlauthority.com/2009/06/23/sql-server-2005-2008-delete-duplicate-rows/