TSQL split?

Hello,
There is a table with [periodGain] metric and that has a start and end date. I want to convert that data in such a way so that periodGain metric and its info are repeated for several rows at a single date level – where the date is between the start and the end. Please see attached excel. Let me know how I can do it.
Thank you
R
tsql-date-everyday.xlsx
RayneAsked:
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Koen Van WielinkBusiness Intelligence SpecialistCommented:
This should do the trick:

--Test data

Create table #PeriodGain
(	periodGain		nvarchar(12)
,	category		nvarchar(12)
,	sub_group		nvarchar(12)
,	[start_DATE]	datetime
,	end_DATE		datetime
)

insert into #PeriodGain
values	('p0045', 'cat12', 's1', '20140101', '20140109')
	,	('p0098', 'cat19', 's2', '20140305', '20140321');
	
-- Insert the record with the start date in a CTE
-- then add a recursive part to add all the 
-- required dates between the start and end date.
With A
	(	periodGain
	,	category
	,	sub_group
	,	date_everyday	)
as
(
Select		periodGain
		,	category
		,	sub_group
		,	[start_DATE]
from	#PeriodGain

union all

Select		p.periodGain
		,	p.category
		,	p.sub_group
		,	DATEADD(day, 1, A.date_everyday)
from	A
		inner join #PeriodGain p
			on a.periodGain = p.periodGain
			and a.category = p.category
			and a.sub_group = p.sub_group
Where	A.date_everyday < p.end_DATE
)

-- Select final data set

select *
from A
order by	a.periodGain
		,	a.category
		,	a.sub_group
		,	a.date_everyday

-- Drop the temp table
drop table #PeriodGain

Open in new window


Using a recursive query you can keep adding the dates to the dataset until the condition A.date_everyday < p.end_DATE is met.
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RayneAuthor Commented:
Thank you Koen, this is AWESOME :)
I may ask question later if any

Thank you friend
0
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