转置多个相关列

Question

虽然转置单列非常简单，但我需要转置大量数据，需要转置 3 组 10 多个相关列。

create table test
(month int,year int,po1 int,po2 int,ro1 int,ro2 int,mo1 int,mo2 int, mo3 int);

insert into test 
values
(5,2013,100,20,10,1,3,4,5),(4,2014,200,30,20,2,4,5,6),(6,2015,200,80,30,3,5,6,7) ;

select * FROM test;

给予

month	year	po1	po2	ro1	ro2	mo1	mo2	mo3
5	2013	100	20	10	1	3	4	5
4	2014	200	30	20	2	4	5	6
6	2015	200	80	30	3	5	6	7

使用 UNPIVOT 转置

select
  month, year, 
  PO, RO, MO
from ( SELECT * from test) src

unpivot
    ( PO for Description in (po1, po2))unpiv1
unpivot
    (RO for Description1 in (ro1, ro2)) unpiv2
unpivot
    (MO for Description2 in (mo1, mo2, mo3)) unpiv3

order by year

给我这个

month	year	PO	RO	MO
5	2013	100	10	3
5	2013	100	10	4
5	2013	100	10	5
5	2013	100	1	3
5	2013	100	1	4
5	2013	100	1	5
5	2013	20	10	3
5	2013	20	10	4
5	2013	20	10	5
5	2013	20	1	3
5	2013	20	1	4
5	2013	20	1	5
4	2014	200	20	4
4	2014	200	20	5
4	2014	200	20	6
4	2014	200	2	4
4	2014	200	2	5
4	2014	200	2	6
4	2014	30	20	4
4	2014	30	20	5
4	2014	30	20	6
4	2014	30	2	4
4	2014	30	2	5
4	2014	30	2	6
6	2015	200	30	5
6	2015	200	30	6
6	2015	200	30	7
6	2015	200	3	5
6	2015	200	3	6
6	2015	200	3	7
6	2015	80	30	5
6	2015	80	30	6
6	2015	80	30	7
6	2015	80	3	5
6	2015	80	3	6
6	2015	80	3	7

我想把它变成这样的东西。这可能吗？

month	year	PO	RO	MO
5	2013	100	10	3
5	2013	20	1	4
5	2013	0	0	5
4	2014	200	20	4
4	2014	30	2	5
4	2014	0	0	6
6	2015	200	30	5
6	2015	80	3	6
6	2015	0	0	7

Answer 1

也许使用如下查询，使用 CROSS APPLY 根据您的设计创建行

select month,year,po,ro,mo from 
test cross apply 
(values (po1,ro1,mo1), (po2,ro2,mo2),(0,0,mo3))v(po,ro,mo)

查看演示 here

Answer 2

Unpivot 的行为类似于 union，在您的情况下使用 union all

SELECT month,
       year,
       po1 AS PO,
       ro1 AS RO,
       mo1 AS MO
FROM   test
UNION ALL
SELECT month,
       year,
       po2,
       ro2,
       mo2
FROM   test
UNION ALL
SELECT month,
       year,
       0,
       0,
       mo2
FROM   test

转置多个相关列

Transposing multiple related columns

sql

tsql

sql-server

unpivot

cross-apply