Question

Date       Starting      Ending

10/01/2010      0            100
10/02/2010     100           200
10/03/2010     200           300
10/04/2010     300             0   

the table has only one column that is ending and i need the output similar to one shown above and using sqlserver 2005

Answer 1

可能不是最佳解决方案，但如果一次性操作和性能不是问题，则可以使用以下方法

创建功能GetPreviousVal
（
@PrevVal int ）返回int 如 BEGIN

DECLARE @ReturnVal INT

SELECT TOP 1 @ReturnVal = Ending 
FROM RowVal
WHERE Ending < @PrevVal
ORDER BY Ending DESC


RETURN @ReturnVal

END

GO

现在，使用上述功能更新您的数据

UPDATE RowVal
SET Starting = ISNULL(dbo.GetPreviousVal(Ending),0)

Answer 2

假设有一个名为SampleData的表，以及名为Date和Starting的列，您可以执行此操作来查询该表：

SELECT S1.Date, S1.Starting, ISNULL(S2.Starting, 0) as Ending
FROM SampleData S1
LEFT OUTER JOIN
(
    SELECT *
    FROM SampleData
) S2
ON DATEADD(d, 1, S1.Date) = S2.Date

将返回：

Date       Starting      Ending

10/01/2010      0            100
10/02/2010     100           200
10/03/2010     200           300
10/04/2010     300             0

如果您想更新表格，可以执行以下操作：

UPDATE SampleData
SET Starting = Ending
FROM SampleData S3 
INNER JOIN
(
    SELECT S1.Date, ISNULL(S2.Starting, 0) as Ending
    FROM SampleData S1
    LEFT OUTER JOIN
    (
        SELECT *
        FROM SampleData
    ) S2
    ON DATEADD(d, 1, S1.Date) = S2.Date
) S4 ON S3.Date = S4.Date

如何将上一行值分配给下一行

2 个答案: