ROW_NUMBER를 통해 여러 피벗을 수행하는 트릭은 순서와 필드 번호를 모두 저장하기 위해 해당 행 번호 순서를 수정하는 것입니다. 다음은 여러 PIVOT 문으로 원하는 것을 수행하는 예제입니다.
-- populate some test data
if object_id('tempdb..#tmp') is not null drop table #tmp
create table #tmp (
ID int identity(1,1) not null,
MainField varchar(100),
ThatField int,
ThatOtherField datetime
)
insert into #tmp (MainField, ThatField, ThatOtherField)
select 'A', 10, '1/1/2000' union all
select 'A', 20, '2/1/2000' union all
select 'A', 30, '3/1/2000' union all
select 'B', 10, '1/1/2001' union all
select 'B', 20, '2/1/2001' union all
select 'B', 30, '3/1/2001' union all
select 'B', 40, '4/1/2001' union all
select 'C', 10, '1/1/2002' union all
select 'D', 10, '1/1/2000' union all
select 'D', 20, '2/1/2000' --union all
-- pivot over multiple columns using the 1.1, 1.2, 2.1, 2.2 sequence trick
select
MainField,
max([1.1]) as ThatField1,
max([1.2]) as ThatOtherField1,
max([2.1]) as ThatField2,
max([2.2]) as ThatOtherField2,
max([3.1]) as ThatField3,
max([3.2]) as ThatOtherField3,
max([4.1]) as ThatField4,
max([4.2]) as ThatOtherField4
from
(
select x.*,
cast(row_number() over (partition by MainField order by ThatField) as varchar(2)) + '.1' as ThatFieldSequence,
cast(row_number() over (partition by MainField order by ThatField) as varchar(2)) + '.2' as ThatOtherFieldSequence
from #tmp x
) a
pivot (
max(ThatField) for ThatFieldSequence in ([1.1], [2.1], [3.1], [4.1])
) p1
pivot (
max(ThatOtherField) for ThatOtherFieldSequence in ([1.2], [2.2], [3.2], [4.2])
) p2
group by
MainField
정확히 무엇이 필요합니까? –
잘 해내려고 노력했습니다 (블로그의 3 번째 접근 방식). http://dba.stackexchange.com/questions/65786/query-pivot-multiple-columns-variable-number-ofrows – JayaPrakash