如何根据相关列的值将值从行转到列

Question

我正在尝试根据 3 个值对一组数据进行透视，以便每一行代表与每个 ID 相关的所有配置文件 URL，每一列都与配置文件代码相关

这个问题与我想要实现的非常相似，但是它没有根据另一个值对正在旋转的列进行分组：

所以给出下面的例子table:

Id        ProfileCode  ProfileURL  
-------------------------------------------------------
7ADC7368  IA           http://www.domainIA.com/profile1
5C627D6F  IA           http://www.domainIA.com/profile2
5C627D6F  AG           http://www.domainAG.com/profile1
5C627D6F  AF           http://www.domainAF.com/profile1
664B4AE9  IA           http://www.domainIA.com/profile3
664B4AE9  AF           http://www.domainAF.com/profile2

我希望能改成下面的样子table:

Id        IA                                AG                                AF
-------------------------------------------------------------------------------------------------------------
7ADC7368  http://www.domainIA.com/profile1  null                              null
5C627D6F  http://www.domainIA.com/profile2  http://www.domainAG.com/profile1  http://www.domainAF.com/profile1
664B4AE9  http://www.domainIA.com/profile3  null                              http://www.domainAF.com/profile2

这是我一直在尝试使用的代码，但我找不到一种方法将枢轴与配置文件 URL 及其关联的配置文件代码之间的关联相关联。

declare @tmp TABLE (Id NVARCHAR(15), ProfileCode NVARCHAR(2), ProfileURL NVARCHAR(50))

insert into @tmp (Id, ProfileCode, ProfileURL)
values  ('7ADC7368', 'IA', 'http://www.domainIA.com/profile1'),
        ('5C627D6F', 'IA', 'http://www.domainIA.com/profile2'),
        ('5C627D6F', 'AG', 'http://www.domainAG.com/profile1'),
        ('5C627D6F', 'AF', 'http://www.domainAF.com/profile1'),
        ('664B4AE9', 'IA', 'http://www.domainIA.com/profile3'),
        ('664B4AE9', 'AF', 'http://www.domainAF.com/profile2')

select 
     pvt.id,
    CASE
        WHEN ProfileCode = 'IA' THEN ProfileURL 
    END AS 'IA',
    CASE
        WHEN ProfileCode = 'AF' THEN ProfileURL 
    END AS 'AF',
    CASE
        WHEN ProfileCode = 'AG' THEN ProfileURL
    END AS 'AG'
from (  
    select 
         Id, ProfileCode, ProfileURL
        ,ROW_NUMBER() over(partition by ProfileCode order by ProfileURL) as RowNum
from 
    @tmp
) a
pivot (MAX(ProfileCode) for RowNum in ('IA', 'AF', 'AG') as pvt

对于我正在努力实现的目标，如果有任何帮助或指点，我将不胜感激。

Answer 1

只使用条件聚合：

SELECT id,
       MAX(CASE WHEN ProfileCode = 'IA' THEN ProfileURL END) AS IA,
       MAX(CASE WHEN ProfileCode = 'AF' THEN ProfileURL END) AS AF,
       MAX(CASE WHEN ProfileCode = 'AG' THEN ProfileURL END) AS AG
FROM @tmp t
GROUP BY id;

如果给定 ID 有多个相同的代码，则只需要 ROW_NUMBER() 并且您希望在不同的行上显示结果。您的示例数据和当前逻辑表明情况并非如此。

如何根据相关列的值将值从行转到列

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