SQL WITH NOT

-1

我創建了一個查詢，但它不工作。任何人都可以向我解釋這個嗎？謝謝！SQL WITH NOT

WITH rows AS 
    (
    SELECT *, ROW_NUMBER() OVER (ORDER BY dtDeliveryDate) AS rn 
    FROM TCheckRecipient 
    ) 

select avg(avarage) from(  
SELECT TCheck.iCheckId, AVG(DATEDIFF(minute, mc.dtDeliveryDate, mp.dtDeliveryDate)) as avarage 
FROM rows mc 
left join TCheck on TCheck.iCheckId = mc.iCheckId 

JOIN rows mp 
ON  mc.rn = mp.rn - 1 
group by TCheck.iCheckId 
)

我在做

WITH rows AS 
     (
     SELECT *, ROW_NUMBER() OVER (ORDER BY dtDeliveryDate) AS rn 
     FROM TCheckRecipient 
     ) 

SELECT TCheck.iCheckId, AVG(DATEDIFF(minute, mc.dtDeliveryDate, mp.dtDeliveryDate)) as avarage 
FROM rows mc 
left join TCheck on TCheck.iCheckId = mc.iCheckId 

JOIN rows mp 
ON  mc.rn = mp.rn - 1 
group by TCheck.iCheckId

它運作良好。但是，當我試圖讓這些收益的平均值，而我不能，我會很高興，如果有人回答我該怎麼辦呢謝謝

來源

2016-02-29 Lea

你得到的錯誤是什麼？很可能你需要在子查詢上添加一個別名，即在右括號後面，例如「A」，以便內查詢在外查詢 –

'group by TCheck.iCheckId 中有一個引用）當我在做什麼？ – artm

「這不起作用」不是一個很好的描述。它不會編譯，它會拋出一個錯誤，它會給出意想不到的輸出嗎？ – HoneyBadger

我把一個答案讓我的評論有更清晰。您可能只需要別名內部查詢。

WITH rows AS 
    (
    SELECT *, ROW_NUMBER() OVER (ORDER BY dtDeliveryDate) AS rn 
    FROM TCheckRecipient 
    ) 

select avg(avarage) from(  
SELECT TCheck.iCheckId, AVG(DATEDIFF(minute, mc.dtDeliveryDate, mp.dtDeliveryDate)) as avarage 
FROM rows mc 
left join TCheck on TCheck.iCheckId = mc.iCheckId 

JOIN rows mp 
ON  mc.rn = mp.rn - 1 
group by TCheck.iCheckId 
) A

來源

2016-02-29 10:54:58

回答

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