SQL WITH NOT

-1

我创建了一个查询，但它不工作。任何人都可以向我解释这个吗？谢谢！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

它运作良好。但是，当我试图让这些收益的平均值，而我不能，我会很高兴，如果有人回答我该怎么办呢谢谢

来源

2016-02-29 Lea

你得到的错误是什么？很可能你需要在子查询上添加一个别名，即在右括号后面，例如“A”，以便内查询在外查询 –

'group by TCheck.iCheckId 中有一个引用）当我在做什么？ – artm

“这不起作用”不是一个很好的描述。它不会编译，它会抛出一个错误，它会给出意想不到的输出吗？ – HoneyBadger

我把一个答案让我的评论有更清晰。您可能只需要别名内部查询。

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

来源

2016-02-29 10:54:58

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