行列转换

CREATE proc [dbo].[R_Parities_Config_CurrencyExchangeRate_V2]
@FromCode nvarchar(400),
@ToCode nvarchar(400),
@EffectiveDate nvarchar(400),
@ChangeDate nvarchar(400)
as
begin
SET NOCOUNT ON;
select f.col as FromCode into #FromTable from (select distinct col from dbo.[Split](@FromCode, ',')) as f
where f.col in (select distinct FromCode from Config_CurrencyExchangeRate where ToCode = @ToCode and FromCode != @ToCode)
select * into #ToTable from Config_CurrencyExchangeRate
where ToCode = @ToCode and EffectiveDate >=@EffectiveDate and EffectiveDate <=@ChangeDate

select a.EffectiveDate,c.FromCode+'/'+a.ToCode as CurrencyType,a.Rate into #a from #ToTable as a
right join #FromTable as c on c.FromCode = a.FromCode order by a.EffectiveDate desc

declare @groupField varchar(1000)
select @groupField=isnull(@groupField,'')+case when isnull(@groupField,'')='' then '' else ',' end+QUOTENAME(CurrencyType)
from (select rtrim(CurrencyType) as CurrencyType from (select distinct CurrencyType from #a) as a )t
declare @sql nvarchar(4000)
set @sql=N'
select *
from
(select EffectiveDate,rtrim(CurrencyType) as CurrencyType,
MAX(Rate) as Rate
from #a
group by EffectiveDate,rtrim(CurrencyType)
) as x
pivot (MAX(Rate)for CurrencyType in ('+@groupField+')) as pvt
order by EffectiveDate desc'
EXEC (@sql)

drop table #a

end

--execute [R_Parities_Config_CurrencyExchangeRate_V2] 'CAD,USD','USD','2010-12-12','2016-12-12'

--select distinct ToCode,FromCode from Config_CurrencyExchangeRate
GO