sql – 根据ID列将行转换为列

我目前正在运行SQL Server 2008并尝试获取以下子查询数据：

ID | Field Name | Field Selection
1  |  Rating 1  |      Good
1  |  Rating 2  |      Good
1  |  Rating 3  |      Bad
2  |  Rating 1  |      OK

根据ID列分组为一行：

ID | Rating 1 | Rating 2 | Rating 3
1  |    Good  |    Good  |   Bad
2  |     OK   |    NULL  |   NULL

这可能吗？提前致谢！

干杯,
硅

解决方法

select
    p.*
from Table1
pivot(
    max([Field Selection])
    for [Field Name] in ([Rating 1],[Rating 2],[Rating 3])
) as p

或者你可以手动转动：

select
    ID,max(case when [Field Name] = 'Rating 1' then [Field Selection] end) as [Rating 1],max(case when [Field Name] = 'Rating 2' then [Field Selection] end) as [Rating 2],max(case when [Field Name] = 'Rating 3' then [Field Selection] end) as [Rating 3]
from Table1
group by ID

sql fiddle demo

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