Question

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How to remove duplicate records in a table?

I’m having one table which contains one of the column with ProjectID which has duplicate records in the table. And table having Primary key column. I want to keep one record & delete the rest duplications.
Following query is to find the total number of duplicate records with the no. of occurrences-

SELECT ProjectID, 
COUNT(ProjectID) AS NumOccurrences
FROM MyTable
GROUP BY ProjectID
HAVING ( COUNT(ProjectID) > 1 )

How to do this?

Thanks.

Answer 1

;with cte as
(
  select row_number() over(partition by ProjectID order by ProjectID) as rn
  from MyTable
)
delete cte
where rn > 1