SQL Server 2008 R2中，转换列行和列的列

Question

当前数据表

id AA BB CC DD EE FF 
1 a b c d e f 
2 a1 b2 c3 d2 e4 f2 

而且我想：

Colx 1 2 
AA  a a1 
BB  b b2 
CC  c c3 
DD  d d2 
EE  e e4 
FF  f f2 

请帮助我。

Answer 1

好吧，在仔细查看你的问题后，我认为这不是重复的，你不仅要将列转换为行，还要将行同时转换为列。
所以，你有两个解决方案结合 - unpivoting列行和枢行列，是这样的：

select 
    c.name as ColX, 
    max(case when t.id = 1 then c.value else null end) as [1], 
    max(case when t.id = 2 then c.value else null end) as [2] 
from Table1 as t 
    cross apply (values 
     ('AA', t.AA), 
     ('BB', t.BB), 
     ('CC', t.CC), 
     ('DD', t.EE) 
    ) as c(name, value) 
group by c.name 

sql fiddle demo

你也可以使用standard pivot and unpivot从SQL Server：

select * 
from Table1 as t 
unpivot (
    value for 
    colx in (AA, BB, CC, DD, EE, FF) 
) as unpiv 
pivot (
    max(unpiv.value) 
    for id in ([1], [2]) 
) as piv 

sql fiddle demo

如果你不想指定VA ID和列的梅毒，尝试动态SQL：

declare @stmt1 nvarchar(max), @stmt2 nvarchar(max), @stmt nvarchar(max) 

select @stmt1 = 
    isnull(@stmt1 + ', ', '') + 
    '(''' + c.column_name + ''', t.' + c.column_name + ')' 
from information_schema.columns as c 
where c.table_name = 'Table1' and c.column_name <> 'id' 

select @stmt2 = 
    isnull(@stmt2 + ', ', '') + 'max(case when t.id = ' + t.id + ' then c.value end) as [' + t.id + ']' 
from (select distinct cast(id as nvarchar(max)) as id from Table1) as t 

select @stmt = ' 
    select 
     c.name as ColX, ' + @stmt2 + ' 
    from Table1 as t 
     cross apply (values ' + @stmt1 + ') as c(name, value) 
    group by c.name' 

exec sp_executesql @stmt = @stmt 

sql fiddle demo