SQL Total Sale calculation - sql

Question

I have a sale table includes purchases/returns/exchanges
Sample:
--------**saleTbl**------------
CustID | DOP | SKU | Price
111 | 11/05/12 | 001 | 45.99
222 | 11/20/12 | 001 | 45.99
111 | 11/06/12 | 002 | 40.95
111 | 11/06/12 | 001 | -45.99
111 | 11/19/12 | 004 | 50.00
222 | 11/25/12 | 003 | 20.99
111 | 12/01/12 | 002 | -40.95
111 | 12/01/12 | 003 | 20.99
Criteria is: find total for each customer during 11/05/12 - 11/20/12. If customer exchanged the item that was purchased during that time and purchase with the same day will be count.
The expected result is:
CustID | DOP | Price
222 | 11/20/12 | 45.99
111 | 12/01/12 | 70.99
I have tried to get the total but of course it is not right:
SELECT DISTINCT [num_cp] AS 'Member Id'
,MAX([dop]) AS 'Date'
,SUM([price]) AS 'Point'
FROM [Mailing_List].[dbo].[UGG_DoublePoint]
WHERE [num_cp] IN
(
SELECT [num_cp]
FROM [Mailing_List].[dbo].[UGG_DoublePoint]
GROUP BY [num_cp]
HAVING SUM([price]) >0
)
--AND
AND [dop] BETWEEN '11/05/12' AND '11/20/12'
GROUP BY [num_cp]
Please help! Thanks everyone.

Answer 1

I think you need to change your query to this
; WITH CTE AS
(
SELECT *,
COUNT(*) OVER (PARTITION BY CustID, DOP) Row_Cnt
FROM TEST
), CTE2 AS
(
SELECT * FROM CTE
WHERE [dop] BETWEEN '11/05/12' AND '11/20/12'
), CTE3 AS
(
SELECT * FROM CTE2 WHERE price > 0
UNION
SELECT * FROM CTE2 WHERE price < 0
and SKU IN (SELECT SKU FROM CTE2 WHERE Price > 0)
UNION
SELECT * FROM CTE
WHERE row_cnt > 1 and DOP IN (
SELECT max(A.dop) d FROM CTE A
INNER JOIN CTE2 B ON A.CustID = B.CustID AND A.SKU = B.SKU
)
)
SELECT Custid, max(dop) dateid, sum(price) Price
from cte3
group by custid;
Check SQL Fiddle Demo

Answer 2

I think this will work. It basically filters out any returns from the result set by use of a left join.
NOTE: There would be an issue with this in the case that someone purchased/returned multiple SKUs of the same thing on the same day.
select pur.CustId, sum(pur.price) TotalPrice
from test pur
left join test ret
on pur.custid = ret.custid
and pur.dop = ret.dop
and pur.sku = ret.sku
and pur.price = (-1 * ret.price)
where pur.dop between '11/05/2012' AND '11/20/2012'
and ret.price is null
group by pur.CustId