Pivot and INNER JOINs - sql

Question

I have been trying to run a pivot query but I am failing hard, I am very new with all this so please be patient
what I want is to return the Quantities values of each month, jan, feb... dec, for each PartRef
this is what I have
SELECT PartRef
, Year
, fMonth
, sum(Quantity) as Quantity
FROM(SELECT PartRef
, year(DateClosed) as Year
, month(DateClosed) as Month
, SUM(fldShipped) as Quantity
FROM PartsInvoice
INNER JOIN Requests ON PartsInvoice.fID = Requests.WorkItemRef
INNER JOIN PartsLine ON Requests.ID = PartsLine.RequestRef
WHERE Closed = 1 and DateClosed > DateAdd(mm, DateDiff(mm, 0, GetDate()) -12, 0)
GROUP BY PartRef, year(DateClosed), month(DateClosed)
) as SalesHits
PIVOT (
SUM(NOT SURE)FOR NOT SURE IN ([Jan],[Feb],[Mar],[Apr],[May],[June],[July],[Ago],[Sep],[Oct],[Nov],[Dec])
)AS Hits
GROUP BY PartRef, Year, Month

Answer 1

Here you have an example how it works with a table like yours.
declare #table table(
partref int,
year int,
month nvarchar(50),
quantity int
)
insert into #table values
(1,2016,'jan',12),
(1,2016,'feb',12),
(2,2016,'jan',12),
(2,2016,'feb',12),
(1,2016,'jan',12)
select PartRef
, year
, sum([jan]) 'Jan',sum([feb]) 'Feb'
,sum([mar]),sum([apr]),sum([may]),sum([jun]),sum([jul])
,sum([aug]),sum([sep]),sum([oct]),sum([nov]),sum([dec])
from(
SELECT PartRef
, year
, [jan],[feb],[mar],[apr],[may],[jun],[jul],[aug],[sep],[oct],[nov],[dec]
from #table
PIVOT (
SUM(quantity)FOR month IN ([jan],[feb],[mar],[apr],[may],[jun],[jul],[aug],[sep],[oct],[nov],[dec])
)AS Hits
) as t
group by PartRef,year

Answer 2

here is the full scope of my query and I believe I got it to work :)
SELECT *
FROM(SELECT PartRef
, year(DateClosed) as Year
, month(DateClosed) as Month
, SUM(Shipped) as Quantity
FROM PartsInvoice
INNER JOIN Requests ON PartsInvoice.ID = Requests.WorkItemRef
INNER JOIN PartsLine ON Requests.ID = PartsLine.RequestRef
WHERE HasClosed = 1 and DateClosed > DateAdd(mm, DateDiff(mm, 0, GetDate()) -13, 0)
GROUP BY PartRef, year(DateClosed), month(DateClosed)
UNION ALL
--RO
SELECT PartRef
, year(DateClosed) as Year
, month(DateClosed) as Month
, SUM(Shipped) as Quantity
FROM RepairOrder
INNER JOIN Requests ON RepairOrder.ID = Requests.WorkItemRef
INNER JOIN PartsLine ON Requests.ID = PartsLine.RequestRef
WHERE Status = 3 and DateClosed > DateAdd(mm, DateDiff(mm, 0, GetDate()) -13, 0)
GROUP BY PartRef, year(DateClosed), month(DateClosed)
UNION ALL
-- Historical Hits
SELECT PartRef
, year(date) as Year
, month(Date) as Month
, SUM(Quantity) as Quantity
FROM PartsHistoricalHits
WHERE Date > DateAdd(mm, DateDiff(mm, 0, GetDate()) -13, 0)
GROUP BY PartRef, year(Date), month(Date)
) as SalesHits
PIVOT (
COUNT (Quantity)FOR fldMonth IN ([1],[2],[3],[4],[5],[6],[7],[8],[9],[10],[11],[12],[13])
)AS Hits