我在 SQL Server 中有两个表:客户和地址
客户表 :
CustomerID FirstName LastName
----------- ---------- ----------
1 Andrew Jackson
2 George Washington
地址表 :
AddressID CustomerID AddressType City
----------- ----------- ----------- ----------
1 1 Home Waxhaw
2 1 Office Nashville
3 2 Home Philadelphia
这是我需要的输出:
CustomerID Firstname HomeCity OfficeCity
----------- ---------- ---------- ----------
1 Andrew Waxhaw Nashville
2 George Philadelphia Null
这是我的查询,但没有得到正确的结果:
SELECT CustomerID, Firstname, HOme as HomeCity, Office as OfficeCity FROM
(SELECT C.CustomerID, C.FirstName, A.AddressID, A.AddressType, A.City
FROM Customer C, Address A
WHERE C.CustomerID = A.CustomerID)as P
PIVOT (MAX(city) FOR AddressType in ([Home],[Office])) as PVT
这是我得到的结果:
CustomerID Firstname HomeCity OfficeCity
----------- ---------- ---------- ----------
1 Andrew Waxhaw NULL
1 Andrew NULL Nashville
2 George Philadelphia Null
如您所见,客户 1 在最终结果中出现了两次。每个客户只能获得一行吗?
我查了这个例子,但没有帮助:http://stackoverflow.com/questions/6267660/sql-query-to-convert-rows-into-columns
谢谢
最佳答案
它给出这一行是因为你有 AddressID
在子查询“P”的选择列表中。因此,即使您的顶层中没有 AddressID,请选择此选项,PIVOT
函数仍然按它分组。您需要将其更改为:
SELECT CustomerID, Firstname, Home as HomeCity, Office as OfficeCity
FROM ( SELECT C.CustomerID, C.FirstName, A.AddressType, A.City
FROM #Customer C, #Address A
WHERE C.CustomerID = A.CustomerID
) AS P
PIVOT
( MAX(city)
FOR AddressType in ([Home],[Office])
) AS PVT
尽管我倾向于使用显式
INNER JOIN
而不是客户和地址之间的隐式连接。
关于带字符串的 SQL 数据透视表,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/10319562/