SQL将列转置为行

Question

我一直在试图换位。

**ProjectNum    PillarID    BusinessPillar**
95329           29          Pillar29
95329           1           Pillar1
95354           1           Pillar1
95354           4           Pillar4
95354           7           Pillar7

入此;

**ProjectNum    Pillars**
95329           Pillar1, Pillar29
95354           Pillar1, Pillar4, Pillar7

我已经看过使用枢轴/非枢轴，并且到目前为止

DECLARE @cols AS NVARCHAR(MAX),
    @query AS NVARCHAR(MAX)
select @cols = STUFF((SELECT ',' + QUOTENAME(PillarID) 
                from dbo.MyTable
                group by BusinessPillar, PillarID
                order by PillarID
        FOR XML PATH(''), TYPE
        ).value('.', 'NVARCHAR(MAX)') 
    ,1,1,'')
set @query = N'SELECT ProjectNum, ' + @cols + N' from 
         (
            select ProjectNum, PillarID, BusinessPillar
            from dbo.MyTable
        ) x
        pivot 
        (
            max(BusinessPillar)
            for PillarID in (' + @cols + N')
        ) p '
exec sp_executesql @query;

但是，在弄清楚如何将所有透视结果合并到单个逗号分隔的列中（如我期望的示例）时，我遇到了很多麻烦。

任何帮助或指导表示赞赏。

Answer 1

您可以使用以下查询来获得所需的结果：

SELECT ProjectNum, STUFF(
     (SELECT DISTINCT ', ' + BusinessPillar
      FROM Test
      WHERE ProjectNum = t.ProjectNum
      FOR XML PATH (''))
      , 1, 1, '')  AS Pillars
      FROM Test as t
      GROUP BY ProjectNum

这是SQL Fiddle链接： SQL Fiddle

Answer 2

尝试使用LISTAGG：

SELECT ProjectNum, LISTAGG(BusinessPillar, ', ') WITHIN GROUP (ORDER BY BusinessPillar) AS PILLARS
      FROM Test
      GROUP BY ProjectNum

有关LISTAGG的更多信息