0

我对不同的表有类似的 3-4 个脚本来动态 PIVOT，就像之前发布的 Dynamic Pivot (row to columns)

目标： - 创建一个 excel 文件连接 PIVOTed 表中的所有字段（每个表中的所有行）

脚步：

  • 为每个集合创建单独的临时表（在不同表上进行透视之后）

  • 加入列 ID 上的所有临时表

  • 从结果集中选择列（所有临时表）

**想知道是否有更好的方法来创建临时表，该方法使用连接所有表以进行最终选择的过程。

**我尝试创建临时表但收到错误：无效对象

由于上一篇文章中接受的答案**

INSERT into #T1 execute('execute' + @query )
select * from #T1

**

案例 1：在您的桌子上旋转

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

select @colsPivot = STUFF((SELECT ',' 
                      + quotename('Instance'+ cast(instance as varchar(10))+'_'+c.name)
                    from yourtable t
                    cross apply sys.columns as C
                    where C.object_id = object_id('yourtable') and
                         C.name not in ('id', 'instance')
                    group by t.instance, c.name
                    order by t.instance
            FOR XML PATH(''), TYPE
            ).value('.', 'NVARCHAR(MAX)') 
        ,1,1,'')


set @query 
  = 'select *
      from
      (
        select id, 
          ''Instance''+cast(instance as varchar(10))+''_''+col col, 
          value
        from 
        (
          select id, 
            Instance, 
            Name, 
            cast(Size as varchar(50)) Size,
            Tech
          from yourtable
        ) x
        unpivot
        (
          value
          for col in (Name, Size, Tech)
        ) u 
      ) x1
      pivot
      (
        max(value)
        for col in ('+ @colspivot +')
      ) p'

--exec(@query)

我尝试创建临时表，但由于上一篇文章中接受的答案而得到错误：无效对象

INSERT into #T1 execute('execute' + @query )
select * from #T1

案例 2：MYtable 的相同代码 PIVOT

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

select @colsPivot = STUFF((SELECT ',' 
                      + quotename('Instance'+ cast(instance as varchar(10))+'_'+c.name)
                    from mytable t
                    cross apply sys.columns as C
                    where C.object_id = object_id('yourtable') and
                         C.name not in ('id', 'instance')
                    group by t.instance, c.name
                    order by t.instance
            FOR XML PATH(''), TYPE
            ).value('.', 'NVARCHAR(MAX)') 
        ,1,1,'')


set @query 
  = 'select *
      from
      (
        select id, 
          ''Instance''+cast(instance as varchar(10))+''_''+col col, 
          value
        from 
        (
          select id, 
            Instance, 
            Name, 
            cast(Size as varchar(50)) Size,
            Tech
          from mytable
        ) x
        unpivot
        (
          value
          for col in (Name, Size, Tech)
        ) u 
      ) x1
      pivot
      (
        max(value)
        for col in ('+ @colspivot +')
      ) p'


    INSERT into #T2 execute('execute' + @query2 )
    select * from #T2

** 案例 3：OurTable 的相同代码 PIVOT**

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

select @colsPivot = STUFF((SELECT ',' 
                      + quotename('Instance'+ cast(instance as varchar(10))+'_'+c.name)
                    from ourtable t
                    cross apply sys.columns as C
                    where C.object_id = object_id('yourtable') and
                         C.name not in ('id', 'instance')
                    group by t.instance, c.name
                    order by t.instance
            FOR XML PATH(''), TYPE
            ).value('.', 'NVARCHAR(MAX)') 
        ,1,1,'')


set @query 
  = 'select *
      from
      (
        select id, 
          ''Instance''+cast(instance as varchar(10))+''_''+col col, 
          value
        from 
        (
          select id, 
            Instance, 
            Name, 
            cast(Size as varchar(50)) Size,
            Tech
          from ourtable
        ) x
        unpivot
        (
          value
          for col in (Name, Size, Tech)
        ) u 
      ) x1
      pivot
      (
        max(value)
        for col in ('+ @colspivot +')
      ) p'


   INSERT into #T3 execute('execute' + @query2 )
    select * from #T3

最终选择：

select * from #T1
inner join #T1.id=#T2.id
inner join #T1.id=#T3.id
4

1 回答 1

2

您的部分问题是您正在使用动态 sql，并且您希望将其插入临时表以供以后使用。以下是与此相关的问题：

  • 之前无法创建临时表，因为列数未知。
  • 在动态 SQL 中创建的临时表将超出使用范围。创建本地临时表（以单个 # 符号开头的临时表）时存在此问题

如果您想将这些多个表连接在一起，那么您可以创建一个全局临时表或一个可以在动态 SQL 执行期间创建并在该范围之外使用的真实表（不是临时表）。

使用来自OP的代码，我使用正在创建的表对其进行了更改：

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

select @colsPivot = STUFF((SELECT ',' 
                      + quotename('Instance'+ cast(instance as varchar(10))+'_'+c.name)
                    from yourtable t
                    cross apply sys.columns as C
                    where C.object_id = object_id('yourtable') and
                         C.name not in ('id', 'instance')
                    group by t.instance, c.name
                    order by t.instance
            FOR XML PATH(''), TYPE
            ).value('.', 'NVARCHAR(MAX)') 
        ,1,1,'')


set @query 
  = 'select *
     into ##t1  -- < create global temp table or real table without the ##
      from
      (
        select id, 
          ''Instance''+cast(instance as varchar(10))+''_''+col col, 
          value
        from 
        (
          select id, 
            Instance, 
            Name, 
            cast(Size as varchar(50)) Size,
            Tech
          from yourtable
        ) x
        unpivot
        (
          value
          for col in (Name, Size, Tech)
        ) u 
      ) x1
      pivot
      (
        max(value)
        for col in ('+ @colspivot +')
      ) p'

exec(@query);

select * from ##t1

请参阅SQL Fiddle with Demo。

这将允许您将多个表连接在一起。

参考：

于 2013-04-02T15:42:12.540 回答