T-SQL转换/连接/转置行到列

Question

尝试了很多SQL小提琴，但无处可去。我在表格中有以下内容

Col1 | Col2 | Col3
-------------------
 A   | B    | C
 D   | E    | F
 G   | H    | I

我需要输出

 A   | D    | G
 B   | E    | H
 C   | F    | I

请有人帮忙。我知道PIVOT可能是最好的选择吗？

由于

Answer 1

首先将其取消，然后将其推回去。

with --Build up as we go
--Start with original data
t (Col1, Col2, Col3)
as 
(          select 'A','B','C'
 union all select 'D','E','F'
 union all select 'G','H','I')
,
--Put rownums in there - they'll help
numbered as (
select row_number() over (order by Col1) as rownum, *
from t)
,
--Now unpivot the data, using cross apply.
unpivotted as (
select r.rownum, c.colnum, c.val
from numbered r
cross apply (values (1, Col1), (2, Col2), (3, Col3)) as c (colnum, val)
)
--Now pivot it back again, grouping by colnum
select max(case when rownum = 1 then val end), 
       max(case when rownum = 2 then val end), 
       max(case when rownum = 3 then val end)
from unpivotted
group by colnum;