Question

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How to delete duplicate rows with SQL?

I have a table with no primary key and a column with duplicate entries. I want to delete all duplicates keeping one entry in the table. Please help

Answer 1

Since you are using SQL Server 2005+, you can use CTE to perform this:

;WITH cte AS 
(
  SELECT ROW_NUMBER() OVER (PARTITION BY Col1, Col2, Col3  ORDER BY (SELECT 0)) RN
  FROM  yourtable
)
DELETE FROM cte
WHERE RN > 1