TSQL - Exact match on subset of records - sql

Question

I have the following table structure and data
TransID TransType Product Qty OrderRef Date
------- --------- ------- --- -------- ----
C123 Credit Prod1 1 Order8 2014-07-08
C123 Credit Prod2 5 Order8 2014-07-08
Inv111 Invoice Prod1 1 Order8 2014-07-08
Inv111 Invoice Prod2 5 Order8 2014-07-08
C999 Credit Prod1 6 Order8 2014-07-08
C999 Credit Prod2 9 Order8 2014-07-08
Inv666 Invoice Prod1 6 Order8 2014-07-08
What I want to do is to be able to identify those Credit records that have an exact matching group of Invoice records. By exact matching I mean the same Product, OrderRef, Qty and Date
In the above data C123 would match with Inv111 but C999 would not match with Inv666 as Inv666 is missing a row
I want to delete both the Credit and Invoice records that have an exact match. There is no link between Invoice and Credits apart from the OrderRef
I've played around with the Except statement, something like this:-
;with CreditToInvoice(Product, Qty, OrderRef, Date)
as
(select Product
,Qty
,OrderRef
,Date)
from #t t1
where t1.TransType = 'Credit'
group by TransactionID, OrderRef, Product, Date, Qty
EXCEPT
select Product
,Qty
,OrderRef
,Date)
from #t t2
where t2.TransType = 'Invoice'
group by TransactionID, OrderRef, Product, Date, Qty
)
which gives me everything in table a not in table b as I would expect
The problem is I really need the TransactionID's so that I can proceed to delete correctly
Is the Except the wrong statement for this? Could I use a merge?

Answer 1

I think a LEFT JOIN and some GROUPing is the most obvious way to deal with this requirement:
SELECT
cr.TransID,
MAX(inv.TransID) as InvoiceID,
MAX(CASE WHEN inv.TransID is NULL THEN 1 ELSE 0 END) as Unsatsified
FROM
#t cr
left join
#t inv
on
cr.Product = inv.Product and
cr.OrderRef = inv.OrderRef and
cr.Qty = inv.Qty and
cr.Date = inv.Date and
inv.TransType = 'Invoice'
WHERE
cr.TransType = 'Credit'
GROUP BY
cr.TransID
HAVING
MAX(CASE WHEN inv.TransID is NULL THEN 1 ELSE 0 END) = 0
That is, we join together all of the matching rows between a credit and an invoice, and then we only select this result if all credit rows achieved a match.
You can place this in a subquery or CTE and perform an unpivot if you need both TransID values in a single column for the next part of your processing.

Answer 2

The resulting TransIDs should be the ones you need to delete
DECLARE #Trans TABLE
([TransID] varchar(6), [TransType] varchar(7), [Product] varchar(5), [Qty] int, [OrderRef] varchar(6), [Date] datetime)
;
INSERT INTO #Trans
([TransID], [TransType], [Product], [Qty], [OrderRef], [Date])
VALUES
('C123', 'Credit', 'Prod1', 1, 'Order8', '2014-07-08 00:00:00'),
('C123', 'Credit', 'Prod2', 5, 'Order8', '2014-07-08 00:00:00'),
('Inv111', 'Invoice', 'Prod1', 1, 'Order8', '2014-07-08 00:00:00'),
('Inv111', 'Invoice', 'Prod2', 5, 'Order8', '2014-07-08 00:00:00'),
('C999', 'Credit', 'Prod1', 6, 'Order8', '2014-07-08 00:00:00'),
('C999', 'Credit', 'Prod2', 9, 'Order8', '2014-07-08 00:00:00'),
('Inv666', 'Invoice', 'Prod1', 6, 'Order8', '2014-07-08 00:00:00')
;
DECLARE #TransUnique TABLE
([TransID] varchar(6)
)
INSERT INTO #TransUnique
SELECT DISTINCT TransID FROM #Trans
--Remove Credits
DELETE t
FROM #TransUnique t
INNER JOIN (
select t1.*,t2.TransID [TransId2],t2.TransType [TransType2]
From #Trans t1
LEFT JOIN #Trans t2 ON t1.OrderRef=t2.OrderRef
AND t1.Date=t2.Date
AND t1.Qty=t2.Qty
AND t1.Product=t2.Product
AND t2.TransType='Invoice'
WHERE t1.TransType='Credit'
) joined ON t.TransID=joined.TransId AND joined.TransId2 IS NULL
--Remove Invoices
DELETE t
FROM #TransUnique t
INNER JOIN (
select t1.*,t2.TransID [TransId2],t2.TransType [TransType2]
From #Trans t1
LEFT JOIN #Trans t2 ON t1.OrderRef=t2.OrderRef
AND t1.Date=t2.Date
AND t1.Qty=t2.Qty
AND t1.Product=t2.Product
AND t2.TransType='Invoice'
LEFT JOIN #TransUnique tu ON tu.TransID=t1.TransID
WHERE t1.TransType='Credit'
AND tu.TransID IS NULL
) joined ON t.TransID=joined.TransId2
SELECT * FROM #TransUnique

Answer 3

If I am reading this correctly, something like this should work.
select TransID, TransType, Product, Qty, OrderRef, Date from #t t1
where t1.TransType = 'Credit'
and exists (
select 1 from #t t2
where t2.TransType = 'Invoice'
and t2.Product = t1.Product
and t2.Qty = t1.Qty
and t2.OrderRef = t1.OrderRef
and t2.Date = t1.Date
)

Answer 4

Try this in order to get transid
Select TransId
From #t t1
join #t t2
on t1.transtype = 'Credit' and t2.transtype = 'Invoice'
and t1.product=t2.product and t1.qty = t2.qty
and t1.orderef=t2.orderref and t1.date = t2.date