需要有关PIVOT表的帮助

Question

我有一个SQL查询，我需要将其转换为PIVOT表。 现在数据就这样显示...

但是我真的希望它与ProcessDesc一起显示为COLUMN HEADINGS，并且“交集”为DateCompleted，例如...。

我该怎么做呢？ 创建原始查询的查询如下...

SELECT DISTINCT E.DisplayName, EPM.DateCompleted, PS.SortNumber, PS.ProcessDesc
FROM dbo.EPM
  INNER JOIN dbo.PS
    ON EPM.EPS = PS.ID
  INNER JOIN dbo.E
    ON EPM.ID = E.ID
WHERE DisplayName IS NOT NULL
ORDER BY E.DisplayName, PS.SortNumber

Answer 1

试试这个：

#TEMP这将是您的查询生成的：

SELECT DISTINCT E.DisplayName, EPM.DateCompleted, PS.SortNumber, PS.ProcessDesc
FROM dbo.EPM
  INNER JOIN dbo.PS
    ON EPM.EPS = PS.ID
  INNER JOIN dbo.E
    ON EPM.ID = E.ID
WHERE DisplayName IS NOT NULL
ORDER BY E.DisplayName, PS.SortNumber

使用动态SQL的解决方案

declare @sql1 as varchar(4000) = ''
declare @sql2 as varchar(4000) = ''
declare @sql3 as varchar(4000) = ''

set @sql1 = 
'select
    DisplayName
'

select @sql2 = @sql2 +
'   ,max(case when ProcessDesc = ''' + ProcessDesc + ''' then DateCompleted end) as [' + ProcessDesc +']
'
from #TEMP
order by ProcessDesc, ProcessSort

set @sql3 =
'
from #TEMP
group by DisplayName
ORDER BY DisplayName
'
print @sql1 + @sql2 +@sql3
exec(@sql1 + @sql2 +@sql3)

Answer 2

SELECT E.DisplayName, 
MAX(CASE WHEN PS.ProcessDesc='Set-Up Form 1' THEN EPM.DateCompleted END) as [Set-Up Form 1],
MAX(CASE WHEN PS.ProcessDesc='Set-Up Form 2' THEN EPM.DateCompleted END) as [Set-Up Form 2],
MAX(CASE WHEN PS.ProcessDesc='Set-Up Form 3' THEN EPM.DateCompleted END) as [Set-Up Form 3] 
FROM dbo.EPM
  INNER JOIN dbo.PS
    ON EPM.EPS = PS.ID
  INNER JOIN dbo.E
    ON EPM.ID = E.ID
WHERE DisplayName IS NOT NULL
GROUP BY E.DisplayName
ORDER BY E.DisplayName, PS.SortNumber