Question

我在SQL方面比较新，所以如果这很明显我很道歉，但我无法弄清楚如何在主查询的where语句中使用WITH子句查询的结果。我的查询为每个客户提取了第一条记录，并给出了该记录的销售日期：

WITH summary AS(
SELECT ed2.customer,ed2.saledate,
ROW_NUMBER()OVER(PARTITION BY ed2.customer
ORDER BY ed2.saledate)AS rk
FROM Filteredxportdocument ed2)
SELECT s.*
FROM summary s
WHERE s.rk=1

我需要使用上述查询中的日期作为起点，并为每个客户的前12个月提取所有记录，即销售日期介于ed2.saledate和ed2.saledate + 12个月之间。我的主要问题是：

SELECT  ed.totalamountincvat, ed.saledate, ed.name AS SaleRef, 
ed.customer, ed.customername, comp.numberofemployees, 
comp.companyuid
FROM exportdocument AS ed INNER JOIN
FilteredAccount AS comp ON ed.customer = comp.accountid
WHERE (ed.statecode = 0)  AND
ed.saledate BETWEEN ed2.saledate AND DATEADD(M,12,ed2.saledate)

我确信我需要将主要查询添加到WITH子句中，但我无法解决问题。有人能帮忙吗

Answer 1

摘要您只能使用一次。替代解决方案是将存储摘要存储到临时表中，并根据需要多次使用。类似于：从摘要s中选择*到#temp，其中s.rk = 1

Answer 2

这有帮助吗？

;WITH summary AS(
SELECT ed2.customer,ed2.saledate,
ROW_NUMBER()OVER(PARTITION BY ed2.customer
ORDER BY ed2.saledate)AS rk
FROM Filteredxportdocument ed2)

SELECT  ed.totalamountincvat, ed.saledate, ed.name AS SaleRef, 
ed.customer, ed.customername, comp.numberofemployees, 
comp.companyuid
FROM exportdocument AS ed INNER JOIN
FilteredAccount AS comp ON ed.customer = comp.accountid
OUTER APPLY (SELECT s.* FROM summary s WHERE s.rk=1) ed2
WHERE ed.statecode = 0  AND
ed.saledate BETWEEN ed2.saledate AND DATEADD(M,12,ed2.saledate)
and ed.Customer = ed2.Customer

CTE的结果未被缓存或存储，因此您无法重复使用它。

编辑：

根据您的要求，CTE的所有记录都应该是最终结果，这是一个新的查询：

;WITH summary AS(
SELECT ed2.customer,ed2.saledate,
ROW_NUMBER()OVER(PARTITION BY ed2.customer
ORDER BY ed2.saledate)AS rk
FROM Filteredxportdocument ed2)

SELECT  
    ed.totalamountincvat, 
    ed.saledate, 
    ed.name AS SaleRef, 
    ed.customer, 
    ed.customername, 
    comp.numberofemployees, 
    comp.companyuid
FROM 
summary ed2 
left join exportdocument ed 
    on ed.Customer = ed2.Customer
    and ed.statecode = 0  
    AND ed.saledate BETWEEN ed2.saledate AND DATEADD(M,12,ed2.saledate)
INNER JOIN FilteredAccount comp 
    ON ed.customer = comp.accountid
WHERE 
     s.rk=1

使用WITH子句IN的结果，其中主要查询的STATEMENT

2 个答案: