Question

我正在尝试使用SQL Server的一些地理功能来确定客户最近的10个分支机构是什么。这让我得到了我想要的一个客户：

DECLARE @me GEOGRAPHY
DECLARE @HH NVARCHAR(50)

SELECT @Me = CustProspLoc, @HH = HHKEY FROM Customers

SELECT DISTINCT TOP(10) @HH AS CustOmer, BranchNum, CONVERT(DECIMAL(10,1), (BranchLoc.STDistance(@me)) / 1609.344) AS Miles, BranchLoc.STDistance(@me)
FROM 
BranchLocations
WHERE CONVERT(DECIMAL(10,1), (BranchLoc.STDistance(@me)) / 1609.344) < 25  -- less than this many miles
ORDER BY Miles

结果是这样的：

Customer           BranchNum   Miles
------------------ ---------   ---------------------------
20192              14          1.8
20192              145         4.4
20192              193         5.3
20192              7           6.0
20192              17          7.4
20192              8           7.6
20192              3           8.7
20192              2           9.3
20192              9           9.8
20192              1           10.0

但我得到的只是那个客户的结果......如何才能为Customers表中的所有客户提供？

Answer 1

尝试使用此查询

Select * from(
SELECT row_number() over(partition by hhkey order by miles) as rownum,   HHKEY as CustOmer, BranchNum, CONVERT(DECIMAL(10,1), (BranchLoc.STDistance(CustProspLoc)) / 1609.344) AS Miles, BranchLoc.STDistance(CustProspLoc)
FROM 
BranchLocations,Customers
WHERE CONVERT(DECIMAL(10,1),  (BranchLoc.STDistance(CustProspLoc)) / 1609.344) < 25  -- less than this many miles
ORDER BY Miles) as t1 where t1.rownum <= 10

使用变量选择所有记录

1 个答案: