我可以将 PIVOT 与 Microsoft SQL Server 中的内部联接结合起来吗?
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【中文标题】我可以将 PIVOT 与 Microsoft SQL Server 中的内部联接结合起来吗?【英文标题】:Can I combine a PIVOT with an Inner join in microsoft SQL server? 【发布时间】:2011-01-18 21:37:41 【问题描述】:我有以下 SQL 查询:
SELECT CountryID, [10201] AS CountryGDPPerCapita, [10677] AS LifeExpTotal
FROM
(
SELECT CountryID,FieldID,numeric
FROM globaledge.dbo.DIBS_Data
WHERE CountryID IN (3,5)
AND FieldID IN (10201,10677)
AND year = 2002
) SourceTable
PIVOT
(
MAX(numeric)
FOR FieldID IN ([10201],[10677])
) AS PivotTable
ORDER BY PivotTable.CountryID
这会返回如下所示的内容:
CountryID CountryGDPPerCapita LifeExpTotal
3 35985.78 77.24
5 9147.7 74.54
那我还有一个查询如下:
SELECT CountryName, CountryGDP, CountryGDPGrowth
FROM globaledge.dbo.Country_Statistics
WHERE CountryID IN (3,5)
AND year=2002
Order By CountryName
这会产生以下内容:
CountryName CountryGDP CountryGDPGrowth
墨西哥 1567000000000000 1.3
美国 14440000000000000 0.4
另外请注意,我在两个表中都有 CountryID,它们指的是同一个国家。我想要的是创建一个 SQL 查询,可能带有一个 INNER JOIN,它将返回以下内容:
CountryName CountryGDP CountryGDPGrowth CountryGDPPerCapita LifeExpTotal
墨西哥 156700000000000000 1.3 35985.78 77.24
美国 144400000000000000 0.4 9147.7 74.54
谁能帮我做这个查询?或者告诉我这是否可能?
【问题讨论】:
【参考方案1】:这样的事情会起作用:
SELECT
a.CountryID, a.CountryName, a.CountryGDP, a.CountryGDPGrowth
, b.CountryGDPPerCapita, b.LifeExpTotal
FROM
(
SELECT CountryID, CountryName, CountryGDP, CountryGDPGrowth
FROM globaledge.dbo.Country_Statistics
WHERE CountryID IN (3,5)
AND year=2002
) AS a
JOIN
(
SELECT CountryID, [10201] AS CountryGDPPerCapita, [10677] AS LifeExpTotal
FROM
(
SELECT CountryID,FieldID,numeric
FROM globaledge.dbo.DIBS_Data
WHERE CountryID IN (3,5)
AND FieldID IN (10201,10677)
AND year = 2002
) SourceTable
PIVOT
(
MAX(numeric)
FOR FieldID IN ([10201],[10677])
) AS PivotTable
) AS b ON a.CountryID = b.CountryID
Order By a.CountryName
【讨论】:
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