जगदीश खोलिया: Delete Duplicate Records – Rows(SQL Server)

Tuesday, September 20, 2011

Delete Duplicate Records – Rows(SQL Server)

SQL SERVER – Delete Duplicate Records – Rows

Following code is useful to delete duplicate records. The table must have identity column, which will be used to identify the duplicate records. Table in example is has ID as Identity Column and Columns which have duplicate data are DuplicateColumn1, DuplicateColumn2 and DuplicateColumn3.
DELETE
FROM
MyTable
WHERE ID NOT IN
(
SELECT MAX(ID)
FROM MyTable
GROUP BY DuplicateColumn1, DuplicateColumn2, DuplicateColumn3)
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