如何在SQL中删除重复记录

Question

如何删除sql中的重复记录？

Answer 1

在SQL Server 2005与上述:

WITH    q AS
        (
        SELECT  *, ROW_NUMBER() OVER (PARTITION BY dup_column ORDER BY dup_column) AS rn
        FROM    mytable
        )
DELETE
FROM    q
WHERE   rn > 1