Dynamic column name change based on date [T-SQL] - sql

Question

Is there a way to make this work? change static, "13MonthsAgo"
into January?
Original
> COUNT(CASE WHEN dateadd(MONTH, - 13, getdate()) >
> HireDate AND dateadd(MONTH, - 13, getdate()) <
> TerminationDate OR
>TerminationDate IS NULL THEN 1 ELSE NULL END) AS 13Monthsago
Preferred
> COUNT(CASE WHEN dateadd(MONTH, - 13, getdate()) >
> HireDate AND dateadd(MONTH, - 13, getdate()) <
> TerminationDate OR
>TerminationDate IS NULL THEN 1 ELSE NULL END) AS
>DATENAME(month, dateadd(MONTH,-13,getdate()))

Answer 1

A lengthy approach but will work..
declare #MonthName varchar(20)
select 1 num, 'January' name into #Months
union
select 2 num, 'February' name
union
select 3 num, 'March' name
union
select 4 num, 'April' name
union
select 5 num, 'May' name
union
select 6 num, 'June' name
union
select 7 num, 'July' name
union
select 8 num, 'August' name
union
select 9 num, 'September' name
union
select 10 num, 'October' name
union
select 11 num, 'November' name
union
select 12 num, 'December' name
select #MonthName = name from #Months where datepart(mm,getdate()) = num
--Add the other columns to the dataset here
--This is just an example
select HireDate, TerminationDate,
COUNT(CASE WHEN dateadd(MONTH, - 13, getdate()) >
HireDate AND dateadd(MONTH, - 13, getdate()) <
TerminationDate OR
TerminationDate IS NULL THEN 1 ELSE NULL END) AS 13Monthsago
into #Dataset
FROM SomeTable GROUP BY HireDate, TerminationDate
use tempdb
EXEC sp_RENAME '#Dataset.13Monthsago' , #MonthName, 'COLUMN'
SELECT * FROM #Dataset

Answer 2

This could be one way to go about it.
;with cte_Dates AS
(
SELECT CAST('20150101' as DATEtime) as DateStr UNION ALL
SELECT '20150201' UNION ALL
SELECT '20150202' UNION ALL
SELECT '20150203' UNION ALL
SELECT '20150204' UNION ALL
SELECT '20150301' UNION ALL
SELECT '20150401' UNION ALL
SELECT '20150501' UNION ALL
SELECT '20150601' UNION ALL
SELECT '20150701' UNION ALL
SELECT '20150801' UNION ALL
SELECT '20150901' UNION ALL
SELECT '20151001' UNION ALL
SELECT '20151101' UNION ALL
SELECT '20151201'
)
SELECT *
FROM
(SELECT DateStr,DATENAME(MONTH,DateStr) As MONTHS
FROM
cte_Dates
)P
PIVOT
(
count(DateStr)
FOR MONTHS IN ([January], [February],[March],[April],[May],[June],[July],[August],[September],[October],[November],[December])
)AS PVT