SQL-ROW_NUMBER() OVER函数的基本用法(源码案例)

     SELECT SUM(t.AdjustedBalance) AS Allqmye FROM 	(	 
	 SELECT * FROM (
		 SELECT 
				ROW_NUMBER() OVER ( PARTITION BY change.AccountSysNo ORDER BY change.indate DESC ) AS RowNumber ,
				(CASE WHEN account.Source=1 THEN account.VendorSysNo ELSE account.DistributorSysNo END ) AS SysNo,
				change.InDate,
                change.AccountSysNo,
				change.AdjustedBalance
         FROM   [BBCFinance].[dbo].[AccountBalanceChange] change
                INNER JOIN BBCAccount.dbo.Account account ON account.SysNo = change.AccountSysNo
				 LEFT JOIN BBCAccount.dbo.Vendor V WITH ( NOLOCK ) ON V.SysNo = Account.VendorSysNo
				 LEFT JOIN BBCAccount.dbo.Distributor D WITH ( NOLOCK ) ON D.SysNo = Account.DistributorSysNo
				
				 ) r  WHERE SysNo=2272 AND InDate >= '2016/11/23 0:00:00' AND InDate <= '2016/11/30 0:00:00'
		   ) t		      WHERE  RowNumber=1



		    SELECT SUM(t.AdjustedBalance) FROM 	(	 
		 SELECT 
				ROW_NUMBER() OVER ( PARTITION BY change.AccountSysNo ORDER BY change.indate DESC ) AS RowNumber ,
				(CASE WHEN Account.Source=1 THEN Account.VendorSysNo ELSE Account.DistributorSysNo END ) AS SysNo,
                change.AccountSysNo,
				change.AdjustedBalance
         FROM   [BBCFinance].[dbo].[AccountBalanceChange] change
                INNER JOIN BBCAccount.dbo.Account account ON account.SysNo = change.AccountSysNo
				 LEFT JOIN BBCAccount.dbo.Vendor V WITH ( NOLOCK ) ON V.SysNo = Account.VendorSysNo
				 LEFT JOIN BBCAccount.dbo.Distributor D WITH ( NOLOCK ) ON D.SysNo = Account.DistributorSysNo
         WHERE  account.VendorSysNo = 2272
		 AND change.InDate >= '2016/11/23 0:00:00' AND change.InDate <= '2016/11/29 23:59:59'  
		   ) t
		   WHERE t.RowNumber=1