sqlserver 2008 R2 删除重复数据

推荐方法3

 

--方法1：
SELECT  *
FROM    ( SELECT    Row_Number() OVER ( PARTITION BY [orderno] ORDER BY ( SELECT
                                                              0
                                                              ) ) AS RowNO ,
                    *
          FROM      tblMulCharge
        ) t
WHERE   T.RowNO > 1 ;

 

--方法2：

WITH    ct01
          AS ( SELECT   ROW_NUMBER() OVER ( PARTITION BY orderno ORDER BY ( SELECT
                                                              0
                                                              ) ) AS rn
               FROM     tblMulCharge
             )
    DELETE  FROM ct01
    WHERE   rn > 1
    go

--方法3:针对大数据

WITH    ct01
          AS ( SELECT   [ID] ,
                        [OriOrderNo] ,
                        [OrderNo] ,
                        [TotalAmount] ,
                        [PayAmount] ,
                        [ProviderAmount] ,
                        [transaction_id] ,
                        [PNRCode] ,
                        [Consumer] ,
                        [Provider] ,
                        [SellerAccount] ,
                        [BuyerAccount] ,
                        [State] ,
                        [PayTime] ,
                        [PayInfo] ,
                        [RefundTime] ,
                        [refund_id] ,
                        [refund_info] ,
                        [RefundTimeV] ,
                        [refund_id_V] ,
                        [refund_info_V] ,
                        [RefundAmount] ,
                        ROW_NUMBER() OVER ( PARTITION BY orderno ORDER BY ( SELECT
                                                              0
                                                              ) ) AS rn
               FROM     tblMulCharge
             )
    SELECT 
    [ID]
      ,[OriOrderNo]
      ,[OrderNo]
      ,[TotalAmount]
      ,[PayAmount]
      ,[ProviderAmount]
      ,[transaction_id]
      ,[PNRCode]
      ,[Consumer]
      ,[Provider]
      ,[SellerAccount]
      ,[BuyerAccount]
      ,[State]
      ,[PayTime]
      ,[PayInfo]
      ,[RefundTime]
      ,[refund_id]
      ,[refund_info]
      ,[RefundTimeV]
      ,[refund_id_V]
      ,[refund_info_V]
      ,[RefundAmount]
    INTO    dbo.tblMulCharge_tmp
    FROM    ct01
    WHERE   rn = 1
DROP TABLE dbo.tblMulCharge ;
 
EXEC sp_rename 'dbo.tblMulCharge_tmp', 'tblMulCharge'