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select row_number() over(parition by <all your columns> order by (select 1)) rn,* from <your table>
select * from cte where rn>1
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The purpose of this paper is to provide you background on SQL Server. It’s your self-study guide for learning fundamentals. It includes both the history of SQL and its technical basics. Concepts and definitions will form the solid foundation of your future DBA expertise.
SUM(duplicate_rows) OVER ( partition BY (SELECT 1)) sum_duplicate_rows
FROM (SELECT Column1,Column2,Column3,Column4,COUNT(Column4) AS duplicate_rows
GROUP BY Column1,Column2,Column3,Column4
HAVING COUNT(Column4) > 1) t1
ORDER BY duplicate_rows DESC
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