我正在处理一个查询,它将从连接多个表中收集数据并显示数据。
数据如下所示:
Region CountryName ProductID
Latin America/Caribbean BAHAMAS 21
Europe AZERBAIJAN 23
Europe AZERBAIJAN 24
Latin America/Caribbean BAHAMAS 21
Middle East/Africa BAHRAIN 43
Europe BALI 21
Asia Pacific BANGLADHESH 25
Asia Pacific BANGLADHESH 256
Latin America/Caribbean BARBADOS 20
Europe BELARUS 15
Europe BELGIUM 24
我想要这样的结果集
Region CountryName ProductID RecordCount
Latin America/Caribbean BAHAMAS,BARBADOS 21,20 2
Europe AZERBAIJAN,BALI,BELARUS,BELGIUM 23,15,24 4
Asia Pacific BANGLADHESH 25,26 2
Middle East/Africa BAHRAIN 43 1
我已经尝试在下面的Query中合并CountryName和ProductID,但我想要第4列计数值,这是最大b / w产品和国家列。 (即,如果CountryName列有4个国家而Product列有2,那么我的计数应该是4(上面结果集中的第2行),如果Product列有两个Id而country有单个国家名称,那么我的Count应该是2(第3行)在上面的结果集中)它应按地区分组。
SELECT RegionName,
STUFF((SELECT DISTINCT ', ' + CAST(COUNTRY AS NVARCHAR(20)) FROM Countries RX WHERE RX.CountryCode = PD.CountryCode FOR XML PATH('')),1,1,'') AS CountryList,
STUFF((SELECT DISTINCT ', ' + CAST(ProductID AS NVARCHAR(5)) FROM Product RP WHERE RP.ProductID = PD.ProductID FOR XML PATH('')),1,1,'') AS ProductList,
Count(?) AS recCount
FROM Countries CN WITH (NOLOCK)
INNER JOIN Product PD WITH (NOLOCK)
ON PD.CountryCode=CN.CountryCode
GROUP BY RegionName
有没有人知道如何制作这个?
您可以使用stuff()
,len()
函数和内部联接尝试以下查询。
create table #Region (Region Varchar(50), CountryName Varchar(50), ProductID int)
insert into #Region values
('Latin America/Caribbean', 'BAHAMAS', 21),
('Europe', 'AZERBAIJAN', 23),
('Europe', 'AZERBAIJAN', 24),
('Latin America/Caribbean', 'BAHAMAS', 21),
('Middle East/Africa', 'BAHRAIN', 43),
('Europe', 'BALI', 21),
('Asia Pacific', 'BANGLADHESH', 25),
('Asia Pacific', 'BANGLADHESH', 256),
('Latin America/Caribbean', 'BARBADOS', 20),
('Europe', 'BELARUS', 15),
('Europe', 'BELGIUM', 24)
现在实际查询如下所示:
Select a.Region, a.CountryName, b.ProductID,
Case when LEN(b.ProductID) - LEN(REPLACE(b.ProductID, ',',''))+1
>
LEN(a.CountryName) - LEN(REPLACE(a.CountryName, ',',''))+1
then
LEN(b.ProductID) - LEN(REPLACE(b.ProductID, ',',''))+1
else
LEN(a.CountryName) - LEN(REPLACE(a.CountryName, ',',''))+1
end as RecordCount
from(
Select
g1.Region
, stuff((
select distinct ', ' + g.CountryName
from #Region g
where g.Region = g1.Region
for xml path('')
),1,2,'') as CountryName
from #Region g1
group by g1.Region
)a inner join
(
Select
g1.Region
, stuff((
select distinct ', ' + Cast(g.ProductID as CHAR(3))
from #Region g
where g.Region = g1.Region
for xml path('')
),1,2,'') as ProductID
from #Region g1
group by g1.Region
)b on a.Region = b.Region
输出如下所示。
Region CountryName ProductID RecordCount
-----------------------------------------------------------------------------------
Asia Pacific BANGLADHESH 25 , 256 2
Europe AZERBAIJAN, BALI, BELARUS, BELGIUM 15 , 21 , 23 , 24 4
Latin America/Caribbean BAHAMAS, BARBADOS 20 , 21 2
Middle East/Africa BAHRAIN 43 1
你可以找到现场演示Here。