Differentiate full refund vs partial refund - sql

Question

I would like to differentiate between full refund vs partial refund. There is no flag in SQL database thus this request. Little explanation about data.There could be full refund or partial refund to the customers. Full refund is refund of full amount paid by customer and partial is partial amount refund.
I have 2 tables , Order Header and Order Line (Header table have CustomerId,OrderId, OrderDate, OrderGuid, OrderType,Amount,Reasoncode)
(line Tabe have CustomerId,OrderId, OrderDate, OrderGuid,ItemNo,Quantity,LineAmount).
When customer orders it will be like something below in Header level:
OrderId OrderDate CustomerID OrderGuid OrderType Amount ReasonCode
FN1 2018-07-15 1 FN1-1 Sales 50
FN2 2018-07-16 2 FN2-1 Sales 100
Same at Line level:
OrderId OrderDate CustomerID OrderGuid ItemNo LineAmount Qty
FN1 2018-07-15 1 FN1-1 123-0 20 1
FN1 2018-07-15 1 FN1-1 111-0 30 1
FN2 2018-07-16 2 FN2-1 586-0 40 1
FN2 2018-07-16 2 FN2-1 482-1 20 1
FN2 2018-07-16 2 FN2-1 784-1 20 1
FN2 2018-07-16 2 FN2-1 624-0 20 1
When something is refunded Header level:
OrderId OrderDate CustomerID OrderGuid OrderType Amount ReasonCode
FN1 2018-07-20 1 FN1-RF1 Credit 50 Lost_in_post
FN2 2018-07-21 2 FN2-RF1 Credit 60 Damaged_in_transit
Same at Line leveL:
OrderId OrderDate CustomerID OrderGuid ItemNo LineAmount Qty
FN1 2018-07-20 1 FN1-RF1 123-0 20 1
FN1 2018-07-20 1 FN1-RF1 111-0 30 1
FN2 2018-07-21 2 FN2-RF1 482-1 20 1
FN2 2018-07-21 2 FN2-RF1 784-1 20 1
FN2 2018-07-21 2 FN2-RF1 624-0 20 1
Note: There is no RefundDate column but still it's OrderDate the date will the day of refund.
Result expecting: I would like to see them in two different tables
Full refund:
OrderNo ItemNo Qty
FN1_RF1 123-0 1
FN1-RF1 111-0 1
Partial refund:
OrderNo ItemNo Qty
FN2-RF1 482-1 1
FN2-RF1 784-1 1
FN2-RF1 624-0 1
Hope this make sense.
Please ask me if you have any question. Thank you in advance.
Best

Answer 1

The following is a recreation of your problem with an example solution,
but a quick question why is FN2-RF1 considered a partial refund? Since the summed line items = the credited amount in your example.
http://rextester.com/EODK86280

Answer 2

This should do what you want. You can run the following example in SSMS.
First, create the data you provided for testing.
Create [header] table and insert data:
DECLARE #header TABLE ( OrderID VARCHAR(10), OrderDate DATETIME, CustomerID INT, OrderGuid VARCHAR(10), OrderType VARCHAR(10), Amount DECIMAL(18,2), ReasonCode VARCHAR(50) );
INSERT INTO #header (
OrderID, OrderDate, CustomerID, OrderGuid, OrderType, Amount, ReasonCode
) VALUES
( 'FN1', '2018-07-15', 1, 'FN1-1', 'Sales', 50, NULL )
, ( 'FN2', '2018-07-16', 2, 'FN2-1', 'Sales', 100, NULL )
, ( 'FN1', '2018-07-15', 1, 'FN1-RF1', 'Credit', 50, 'Lost_in_post' )
, ( 'FN2', '2018-07-16', 2, 'FN2-RF1', 'Credit', 60, 'Damaged_in_transit' );
Create [line] table and insert data:
DECLARE #line TABLE ( OrderID VARCHAR(10), OrderDate DATETIME, CustomerID INT, OrderGuid VARCHAR(10), ItemNo VARCHAR(10), LineAmount DECIMAL(18,2), Qty INT );
INSERT INTO #line (
OrderID, OrderDate, CustomerID, OrderGuid, ItemNo, LineAmount, Qty
) VALUES
( 'FN1', '2018-07-15', 1, 'FN1-1', '123-0', 20, 1 )
, ( 'FN1', '2018-07-15', 1, 'FN1-1', '111-0', 30, 1 )
, ( 'FN1', '2018-07-20', 1, 'FN1-RF1', '123-0', 20, 1 )
, ( 'FN1', '2018-07-20', 1, 'FN1-RF1', '111-0', 30, 1 )
, ( 'FN2', '2018-07-12', 2, 'FN2-1', '586-0', 40, 1 )
, ( 'FN2', '2018-07-12', 2, 'FN2-1', '482-0', 20, 1 )
, ( 'FN2', '2018-07-12', 2, 'FN2-1', '784-0', 20, 1 )
, ( 'FN2', '2018-07-12', 2, 'FN2-1', '624-0', 20, 1 )
, ( 'FN2', '2018-07-21', 2, 'FN2-RF1', '482-0', 20, 1 )
, ( 'FN2', '2018-07-21', 2, 'FN2-RF1', '784-0', 20, 1 )
, ( 'FN2', '2018-07-21', 2, 'FN2-RF1', '624-0', 20, 1 );
Then we can query against it.
Full Refunds
SELECT
ref.OrderGuid, line.ItemNo, line.Qty
FROM #header ref
INNER JOIN #header sale
ON ref.OrderID = sale.OrderID
AND sale.OrderType = 'Sales'
INNER JOIN #line line
ON ref.OrderGuid = line.OrderGuid
WHERE
ref.OrderType = 'Credit'
AND ref.Amount = sale.Amount
ORDER BY
ref.OrderID;
Returns
+-----------+--------+-----+
| OrderGuid | ItemNo | Qty |
+-----------+--------+-----+
| FN1-RF1 | 123-0 | 1 |
| FN1-RF1 | 111-0 | 1 |
+-----------+--------+-----+
Partial Refunds
SELECT
ref.OrderGuid, line.ItemNo, line.Qty
FROM #header ref
INNER JOIN #header sale
ON ref.OrderID = sale.OrderID
AND sale.OrderType = 'Sales'
INNER JOIN #line line
ON ref.OrderGuid = line.OrderGuid
WHERE
ref.OrderType = 'Credit'
AND ref.Amount < sale.Amount
ORDER BY
ref.OrderID;
Returns
+-----------+--------+-----+
| OrderGuid | ItemNo | Qty |
+-----------+--------+-----+
| FN2-RF1 | 482-0 | 1 |
| FN2-RF1 | 784-0 | 1 |
| FN2-RF1 | 624-0 | 1 |
+-----------+--------+-----+
Take a look at the ref.Amount vs. sale.Amount comparisons to see how this works.