Populate dates within the date range columns in a table

Question

Hi ,
I have a Students table with StudentID, StartDate and EndDate. For one of the requirements, I need to populate all the dates within and includeing the StartDate and EndDate for all the students. Please find the DDL for the source table samples and also below
samples of Source table columns and how the output should be.
create table #Students (ID int,startdate date,Enddate date)
insert into #Students values (1000, '2014-01-01',
'2014-01-10')
insert into #Students values (1000, '2014-02-22',
'2014-02-28')
insert into #Students values (1001, '2013-07-01',
'2013-07-12')
insert into #Students values (1001, '2013-08-01',
'2013-08-03')
insert into #Students values (1001, '2014-04-01',
'2014-04-05')
--select * from #Students order by id,startdate
--drop table #students
Thanks in advance  for your help!

Answer 1

Hi vskindia,
A recursive way to achieve the expected output.
create table #Students (ID int,startdate date,Enddate date)
insert into #Students values (1000, '2014-01-01',
'2014-01-10')
insert into #Students values (1000, '2014-02-22',
'2014-02-28')
insert into #Students values (1001, '2013-07-01',
'2013-07-12')
insert into #Students values (1001, '2013-08-01',
'2013-08-03')
insert into #Students values (1001, '2014-04-01',
'2014-04-05')
;WITH cte AS
SELECT ID,startdate,Enddate FROM #Students
UNION ALL
SELECT ID,DATEADD(DAY,1,startdate) AS startdate,Enddate FROM cte
WHERE startdate<Enddate
SELECT id,startdate FROM CTE ORDER BY ID,startdate
If you have any question, feel free to let me know.
Eric Zhang
TechNet Community Support