Sql 透视后的列名无效

我想要这样的东西：

42 | 41 | 31 |  32 | Name
----------------------------    
 O                    42  
     X                41  
                P     32  
     Y                41  
     Z                41  

数据透视的列标题也是“名称”列中的值。不同的列可以有不同的状态。这就是我所拥有的，但我不断收到一个错误，说

ValveGroupName

列无效

DECLARE @cols AS NVARCHAR(MAX),
        @query  AS NVARCHAR(MAX)

select @cols = stuff((select ',' + quotename(ValveGroupName)
                        from dbo.adm_ValveGroup vgroup,
                             dbo.adm_Station station
                       where station.StationID = vgroup.StationID
                         and station.StationName in ('CBRN') 
                       order by vgroup.ValveGroupName desc
                         for xml path(''), type).value('.', 'nvarchar(max)'), 1, 1, '')

set @query = 'select ValveGroupName,' + @cols + ' from
              (
                select vlog.status,
                       vgroup.ValveGroupName                   
                  from dbo.adm_Station station,
                       dbo.adm_ValveGroup vgroup,
                       dbo.valvegroup_log vlog
                 where station.StationID = vgroup.StationID
                   and vgroup.ValveGroupID = vlog.ValveGroupID
                   and station.StationName in (''CBRN'')
                   and vlog.logdate between ''2012-10-01'' and ''2012-10-30''
              ) x
              pivot
              (
                 max(status)
                 for ValveGroupName in (' + @cols + ')
              ) p '

execute (@query)

---

此查询有什么问题？

由于您的

ValveGroupName

将成为PIVOT中的新列名，因此您通常不会将其包含在最终选择列表中。由于基本上是“删除”ValveGroupName以成为新列，因此SQL Server不再具有该列，因此会抛出一个错误

代码通常是：

set @query = 'select ' + @cols + ' 
          from
          (
            select vlog.status,
                   vgroup.ValveGroupName                   
              from dbo.adm_Station station
              inner join dbo.adm_ValveGroup vgroup
                 on vgroup.ValveGroupID = vlog.ValveGroupID
              inner join dbo.valvegroup_log vlog
                 on station.StationID = vgroup.StationID
             where station.StationName in (''CBRN'')
               and vlog.logdate between ''2012-10-01'' and ''2012-10-30''
          ) x
          pivot
          (
             max(status)
             for ValveGroupName in (' + @cols + ')
          ) p '

但是，由于您正在聚合一个字符串，该字符串将为每个

ValveGroupName

返回一行，因此，如果您要返回多行，则需要包含

行编号

：

set @query = 'select ' + @cols + ' 
          from
          (
            select vlog.status,
                   vgroup.ValveGroupName,
                   seq = row_number() over(partition by vgroup.ValveGroupName               
                                             order by vlog.status)
              from dbo.adm_Station station,
              inner join dbo.adm_ValveGroup vgroup
                 on vgroup.ValveGroupID = vlog.ValveGroupID
              inner join dbo.valvegroup_log vlog
                 on station.StationID = vgroup.StationID
             where station.StationName in (''CBRN'')
               and vlog.logdate between ''2012-10-01'' and ''2012-10-30''
          ) x
          pivot
          (
             max(status)
             for ValveGroupName in (' + @cols + ')
          ) p '

---

此更改将允许您在每列中返回多行。注意：我还将代码更改为使用

内部联接

语法而不是逗号联接，条件在

WHERE

子句中。

谢谢。如果我没有做任何左连接或右连接，为什么是内部连接而不是逗号连接？@KrisW逗号语法是内部连接。我将其更改为该语法，因为这是SQL的当前标准。