使用数据透视表填充数据

Question

我有一张这样的桌子,

country 2007    2008    2009
 UK      5       10      20
 uk      5       10      20
 us     10       30      40
 us     10       30      40

但我想像这样填充表格,

country year    Total volumn
 uk     2007    10
 uk     2008    20
 uk     2009    40
 us     2007    20
 us     2008    60
 us     2009    80

如何使用数据透视表或任何其他方法在SQL Server 2008中执行此操作.

http://sqlfiddle.com/#!3/2499a

Answer 1

SELECT country, [year], SUM([Total volumn]) AS [Total volumn]
FROM (
      SELECT country, [2007], [2008], [2009]
      FROM dbo.test137
      ) p
UNPIVOT 
([Total volumn] FOR [year] IN ([2007], [2008], [2009])
) AS unpvt
GROUP BY country, [year]
ORDER BY country, [year]

请参阅演示 SQLFiddle