Loop based on parameter value - sql-server-2008

Question

I need to create a temporary table that is populated based on two parameters:
declare #Start date = '01/01/2015'
declare #End date = '12/31/2015'
The temporary table should have a column that will capture YYYYMM for all the years and month that are between #Start and #End parameter.
Here's what I have so far. I want to stop it at 201412 and then start again at 201501. Instead, this loop keeps going in increment of plus 1 (I do not want to see 201413..so on):
declare #Start date = '01/01/2014'
declare #End date = '12/31/2015'
declare #monthstart as int
declare #monthend as int
declare #increment as int
set #monthstart = (SELECT LEFT(CONVERT(varchar, #Start,112),6))
set #monthend = (SELECT LEFT(CONVERT(varchar, #End,112),6))
create table #datetemp (RelevantYYYYMM int)
insert into #datetemp values (#monthstart)
set #increment = #monthstart
While #increment < #monthend
BEGIN
set #increment = (select Max(RelevantYYYYMM) + 1 from #datetemp)
insert into #datetemp values (#increment)
set #increment = (select Max(RelevantYYYYMM) from #datetemp)
IF (select Max(RelevantYYYYMM) from #datetemp) > #monthend
Break
else
continue
END
select * from #datetemp

Answer 1

You can use tally table and avoid loop:
CREATE TABLE #datetemp (RelevantYYYYMM INT);
DECLARE #Start DATE = '01/01/2015', #End DATE = '12/31/2015';
WITH tally_table AS
(
SELECT TOP 1000 rn = ROW_NUMBER() OVER(ORDER BY name) - 1
FROM master..spt_values
)
INSERT INTO #datetemp(RelevantYYYYMM)
SELECT LEFT(CONVERT(varchar, DATEADD(month, rn, #Start),112),6)
FROM tally_table
WHERE YEAR(DATEADD(month, rn, #Start)) <= YEAR(#End)
AND MONTH(DATEADD(month, rn, #Start)) <= MONTH(#End)
SELECT *
FROM #datetemp;
LiveDemo