I need help with a LEFT JOIN in SQL Server 2008

Hi Experts,
I need help joining the two queries below, and possible using a LEFT JOIN to get my desired result.
I need to display all open purchase orders and the qty_ordered for each of the orders.  I also need to show the qty_received on each of those purchase orders (this value comes from a separate table).

NOTE:  Not all Open Purchase orders exist in the Inventory table.  When I join the two queries below, I want to show all open purchase orders, and if they don't exist in the Inventory then they should display a 0 in the quanity received column.  This is why i think a LEFT JOIN is needed.
The two tables should be joined using the PONUMBER field.


Below I have provide samples of both of my queries along with their respective results.  I have also included a sample of the desired outcome.


QUERY #1 SAMPLE
SELECT I.PONUMBER , I.[ITEMNMBR],  SUM(I.[QTYORDER]) AS [QTYOrdered]
FROM POHeader as P
inner join  PODetail as I on  P.PONUMBER = I.PONUMBER
where I.[POLNESTA] not in (4,5,6) and P.[DOCDATE] >= '1/1/2014'                                         
and I.POTYPE =1
GROUP BY I.PONUMBER ,I.[ITEMNMBR]
ORDER BY I.[ITEMNMBR]

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QUERY #1 OUTPUT:
PONUMBER  	ITEMNMBR  	QTYOrdered
07254		IJK789		780
07465		XYZ432		1250
07503		EFG456		536
07895		ABC123		100

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QUERY #2 SAMPLE:
SELECT A.PONUMBER, A.[ITEMNMBR], SUM(A.QTYRECVD) as [QTYReceived]
FROM  INVENTORY as A
WHERE  A.[DATERECD] >= '1/1/2014'  and A.RCPTSOLD = 0
GROUP BY A.PONUMBER, A.[ITEMNMBR]
ORDER BY A.PONUMBER

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QUERY #2 OUTPUT:
PONUMBER  	ITEMNMBR  	QTYReceived
07465		XYZ432		550
07503		EFG456		300

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DESIRED OUT COME AFTER JOINING BOTH OF THE ABOVE QUERIES:
PONUMBER  	ITEMNMBR  	QTYOrdered	QTYReceived
07254		IJK789		780		        0
07465		XYZ432		1250			550
07503		EFG456		536		       300
07895		ABC123		100		       0

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mainrotorAsked:
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Kyle AbrahamsSenior .Net DeveloperCommented:
try the below:
SELECT D.PONUMBER , D.[ITEMNMBR],  SUM(D.[QTYORDER]) AS [QTYOrdered], sum (isnull, inv.QTYRECVD,0) as QtyReceived
FROM POHeader as P
inner join  PODetail as D on  P.PONUMBER = D.PONUMBER
LEFT JOIN INVENTORY as inv on D.PONUMBER = inv.PONUMBER and D.ITEMNMBR = Inv.ITeMNMBR 
-- not sure if these 2 are needed because they should be filtered out by the POs you're getting, but I left them in.
and  Inv.[DATERECD] >= '1/1/2014'  and Inv.RCPTSOLD = 0
where I.[POLNESTA] not in (4,5,6) and P.[DOCDATE] >= '1/1/2014'                                         
and D.POTYPE =1
GROUP BY D.PONUMBER ,D.[ITEMNMBR]
ORDER BY D.[ITEMNMBR]

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Phillip BurtonDirector, Practice Manager and Computing ConsultantCommented:
I would use a CTE, because it makes it easier to debug:

with tblI as
(
SELECT I.PONUMBER , I.[ITEMNMBR],  SUM(I.[QTYORDER]) AS [QTYOrdered]
FROM POHeader as P
inner join  PODetail as I on  P.PONUMBER = I.PONUMBER
where I.[POLNESTA] not in (4,5,6) and P.[DOCDATE] >= '1/1/2014'                                        
and I.POTYPE =1
GROUP BY I.PONUMBER ,I.[ITEMNMBR]),

tblA as
(SELECT A.PONUMBER, A.[ITEMNMBR], SUM(A.QTYRECVD) as [QTYReceived]
FROM  INVENTORY as A
WHERE  A.[DATERECD] >= '1/1/2014'  and A.RCPTSOLD = 0
GROUP BY A.PONUMBER, A.[ITEMNMBR])

select I.PONUMBER, I.[ITEMNMBR], SUM(QTYOrdered) AS QTYOrdered, sum(QTYReceived) as QTYReceived
FROM tblI
LEFT JOIN tblA
ON tblI.PONUMBER = tblA.PONUMBER
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Vitor MontalvãoMSSQL Senior EngineerCommented:
Yes, you just need to add the 2nd query to the 1st with LEFT JOIN:
SELECT I.PONUMBER , I.[ITEMNMBR],  SUM(I.[QTYORDER]) AS [QTYOrdered], SUM(A.QTYRECVD) as [QTYReceived]
FROM POHeader as P
    INNER JOIN PODetail as I ON P.PONUMBER = I.PONUMBER
    LEFT JOIN INVENTORY as A ON P.PONUMBER = A.PONUMBER
WHERE I.[POLNESTA] NOT IN (4,5,6)
  AND P.[DOCDATE] >= '1/1/2014'                                         
  AND I.POTYPE =1
  AND A.[DATERECD] >= '1/1/2014'
  AND A.RCPTSOLD = 0
GROUP BY I.PONUMBER ,I.[ITEMNMBR]
ORDER BY I.[ITEMNMBR]

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0

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Kyle AbrahamsSenior .Net DeveloperCommented:
Vitor at minimum you have to do the PONumber and the ITEMNMBR.
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Vitor MontalvãoMSSQL Senior EngineerCommented:
What you mean "to do"?
By his example, PONumber and ITEMNMBR are grouped, means that you only need to join on PONumber to get the same Itemnmbr.
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Anthony PerkinsCommented:
Kyle,

You have a small typo:
This:
WHERE   I.[POLNESTA] NOT IN (4, 5, 6)
Should be:
WHERE   D.[POLNESTA] NOT IN (4, 5, 6)
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Kyle AbrahamsSenior .Net DeveloperCommented:
Hi Anthony,

You are correct, I re-aliased the table so it would make more sense, but copied the where condition from the OP.  Must have missed that one.  

Thanks for pointing it out.
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Microsoft SQL Server 2008

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