SQL Server中的动态数据透视表

Question

您好我有下表,我想将EcoYear转向顶部,但没有一定的年限,这些年可以随时开始.另外,不同的情况会有不同的起始年份,所以我需要它来填0而不是null.

CaseID EcoYear NetInv NetOil NetGas
38755   2006   123     2154         525 
38755   2007   123     2154         525 
38755   2008   123     2154         525 
38755   2009   123     2154         525 
38755   2010   123     2154         525 
38755   2011   123     2154         525 
38755   2012   123     2154         525 
38755   2013   123     2154         525 
38755   2014   123     2154         525 
38755   2015   123     2154         525 
38755   2016   123     2154         525 
38755   2017   123     2154         525 
38755   2018   123     2154         525 
38755   2019   123     2154         525 
38755   2020   123     2154         525 

我需要这个表看起来像这样:

CaseID Item 2006 2007 2008 2009 2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 
38755 NetInv
38755 NetOil
38755 NetGas

这最初是使用交叉表使用Access完成的.

Answer 1

这可以在sql server中同时使用a UNPIVOT和a来完成PIVOT.您可以在静态版本中了解要转换的列:

select *
from 
(
  select CaseId, EcoYear, val, item
  from yourtable
  unpivot
  (
    val
    for Item in (NetInv, NetOil, NetGas)
  )u
) x
pivot
(
  max(val)
  for ecoyear in ([2006], [2007], [2008], [2009], [2010], [2011],
                 [2012], [2013], [2014], [2015], [2016], [2017],
                 [2018], [2019], [2020])
) p

看看SQL Fiddle with Demo

动态版本将确定执行时的记录:

DECLARE @colsPivot AS NVARCHAR(MAX),
    @colsUnpivot as NVARCHAR(MAX),
    @query  AS NVARCHAR(MAX)

select @colsPivot = STUFF((SELECT distinct ',' + QUOTENAME(EcoYear) 
                    from yourtable
            FOR XML PATH(''), TYPE
            ).value('.', 'NVARCHAR(MAX)') 
        ,1,1,'')

select @colsUnpivot = stuff((select ','+quotename(C.name)
         from sys.columns as C
         where C.object_id = object_id('yourtable') and
               C.name LIKE 'Net%'
         for xml path('')), 1, 1, '')


set @query 
  = 'select *
      from
      (
        select caseid, ecoyear, val, col
        from yourtable
        unpivot
        (
          val
          for col in ('+ @colsunpivot +')
        ) u
      ) x1
      pivot
      (
        max(val)
        for ecoyear in ('+ @colspivot +')
      ) p'

exec(@query)

看看SQL Fiddle with Demo