我正在此SQL函数中编写SQL Server 2012
;With Quote as (
SELECT SID,SHEET,Code, Date, Data,
LAG(Data) OVER(ORDER BY Date) As LastMonthData
FROM RMQ_DATA WHERE [SHEET] IN(0)
)
SELECT [Quote].[SID], Quote.DATE,Quote.DATA,Quote.SHEET, Quote.CODE,
CASE
WHEN ISNULL(LastMonthData, 0) = 0 THEN null
ELSE (LastMonthData/Data) * 100
END As Quote,
RMQ_SUBCAT.TARGET_CODE, RMQ_SUBCAT.RMQ_SUBCAT, RMQ_CAT.RMQ_CAT_NAME,
RMQ_CAT.ENABLED
FROM Quote
Left outer Join RMQ_SUBCAT on Quote.CODE =RMQ_SUBCAT.TARGET_CODE
left outer join RMQ_CAT on RMQ_SUBCAT.TARGET_SID=RMQ_CAT.SID
where RMQ_CAT.ENABLED='Y' and
Quote.DATE between '2015/01/01' and '2015/11/01'
但在第一行
With Quote as (
SELECT SID,SHEET,Code, Date, Data,
LAG(Data) OVER(ORDER BY DATE)
** LAG（Data）我有一个错误。所以我不知道如何在SQL Server 2008中使用LAG（）函数。
有人可以帮我吗？
不幸的LAG是，SQL Server 2012之前的版本不可用。您必须使用ROW_NUMBER自连接来代替：
;With Quote as (
SELECT SID, SHEET,Code, [Date], Data,
ROW_NUMBER() OVER (ORDER BY [Date]) AS rn
FROM RMQ_DATA
WHERE [SHEET] IN (0)
), Quote_LAG AS (
SELECT q1.SID, q1.SHEET, q1.Code, q1.[Date], q1.Data,
q2.Data AS LastMonthData
FROM Quote AS q1
LEFT JOIN Quote AS q2 ON q1.rn = q2.rn + 1
)
... rest of the query here
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