How to perform calculation for multiple rows in sql - sql-server

Question

I have 4 result sets which i moved into one temp table for report purpose:
Date Issued_Id Item_Name Qty_Issued Qty_Return Qty_Damage Type Balance OPBal
----------------------------------------------------------------------------------------------
Dec 18 2014 6003 Bed Covers 4 0 0 IS NULL 245
Dec 18 2014 6008 Bed Covers 4 0 0 IS NULL 245
2014-12-17 6000 Bed Covers 0 22 0 RT NULL 245
2014-12-22 7002 Bed Covers 0 10 0 RT NULL 245
Now I have to add (OPBal=Qty_Issued + OPBal) when Type="IS" and subtract (OPBal=Qty_Return - OPBal) when type="RT".
It should print like this way
Date Issued_Id Item_Name Qty_Issued Qty_Return Qty_Damage Type Balance OPBal
---------------------------------------------------------------------------------------------
Dec 18 2014 6003 Bed Covers 4 0 0 IS NULL 249
Dec 18 2014 6008 Bed Covers 4 0 0 IS NULL 253
2014-12-17 6000 Bed Covers 0 22 0 RT NULL 231
2014-12-22 7002 Bed Covers 0 10 0 RT NULL 221
How can I achieve using cursor in SQL Server?

Answer 1

It's unclear what the sort criteria are for the four rows in your question — it's neither by date nor by Issued_Id. I'm going to assume that the entries should be ordered by Issued_Id, and that your example is a mistake.
The simplest way to get a cumulative sum is to use a window query.
SELECT Date, Issued_Id, Item_Name, Qty_Issued, Qty_Return, Qty_Damage, Type, Balance
, SUM(
CASE WHEN Type='IS' THEN Qty_Issued
WHEN Type='RT' THEN -Qty_Return
END
) OVER (
ORDER BY Issued_Id ROWS UNBOUNDED PRECEDING
) + OPBal AS OPBal
FROM #Temp1
ORDER BY Issued_Id;
It might even be possible to simplify it by ignoring the Type column and the CASE expression altogether.
SELECT Date, Issued_Id, Item_Name, Qty_Issued, Qty_Return, Qty_Damage, Type, Balance
, SUM(Qty_Issued - Qty_Return)
OVER (ORDER BY Issued_Id ROWS UNBOUNDED PRECEDING) + OPBal AS OPBal
FROM #Temp1
ORDER BY Issued_Id;
The setup for the queries above:
CREATE TABLE #Temp1
( Date DATE NOT NULL
, Issued_Id INTEGER NOT NULL
, Item_Name VARCHAR(32) NOT NULL
, Qty_Issued DECIMAL NOT NULL DEFAULT 0
, Qty_Return DECIMAL NOT NULL DEFAULT 0
, Qty_Damage DECIMAL NOT NULL DEFAult 0
, Type VARCHAR(2) NOT NULL
, Balance DECIMAL
, OPBal DECIMAL NOT NULL
);
INSERT INTO #Temp1 VALUES
('2014-12-18', 6003, 'Bed Covers', 4, 0, 0, 'IS', NULL, 245),
('2014-12-18', 6008, 'Bed Covers', 4, 0, 0, 'IS', NULL, 245),
('2014-12-17', 6000, 'Bed Covers', 0, 22, 0, 'RT', NULL, 245),
('2014-12-22', 7002, 'Bed Covers', 0, 10, 0, 'RT', NULL, 245);

Answer 2

Try this
SELECT [Date],
Issued_ID,
Item_Name,
Qty_Issued,
Qty_Return,
Qty_Damage,
[Type],
Balance,
OPBal= CASE
WHEN TYPE = 'IS' THEN Qty_Issued + OPBal
WHEN TYPE = 'RT' THEN Qty_Return - OPBal
ELSE 0
END
FROM #TEMP

Answer 3

It is not clear what your records are to be ordered by. It seems to be Date (oldest first) and Issue_Id (smallest first). If I am wrong abot this, simply change the order by clauses in below statement according to your wishes.
What you are looking for is a kind of running total, where conditionally Qty_Issued and Qty_Return get summed up. You achive this by an analytic use of SUM with a window clause.
SELECT [Date], Issued_Id, Item_Name, Qty_Issued, Qty_Return, Qty_Damage, Type, Balance,
OPBal
+ SUM(case when type = 'IS' then Qty_Issued else 0 end) OVER (ORDER BY [Date] desc, issue_id ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW)
- SUM(case when type = 'RT' then Qty_Return else 0 end) OVER (ORDER BY [Date] desc, issue_id ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW)
AS OPBal
FROM mytable
ORDER BY [Date] desc, issue_id;
As you have zeros in your data for Qty_Issued and Qty_Return where they are not appropriate, you might also simply be able to use:
SELECT [Date], Issued_Id, Item_Name, Qty_Issued, Qty_Return, Qty_Damage, Type, Balance,
OPBal
+ SUM(Qty_Issued - Qty_Return) OVER (ORDER BY [Date] desc, issue_id ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW)
AS OPBal
FROM mytable
ORDER BY [Date] desc, issue_id;

Answer 4

CREATE TABLE #TT
(
[Date] DateTime,
Issued_Id VARCHAR(100),
Item_Name VARCHAR(100),
Qty_Issued INT,
Qty_Return INT,
Qty_Damage INT,
[Type] VARCHAR(100),
Balance INT,
OPBal INT
)
INSERT INTO #TT
SELECT 'Dec 18 2014', 6003,' Bed Covers ', 4,0,0,'IS', NULL,245 UNION ALL
SELECT 'Dec 18 2014', 6008,' Bed Covers ', 4,0,0,'IS', NULL,245 UNION ALL
SELECT '2014-12-17', 6000,' Bed Covers ', 4,22,0,'RT', NULL, 245 UNION ALL
SELECT '2014-12-22', 7002,' Bed Covers ', 4,10,0,'RT', NULL,245
--- IF you want to apply this logic with out any sort(as shown in your question)
SELECT [Date],Issued_Id, Item_Name, Qty_Issued, Qty_Return, Qty_Damage, Type, Balance,
OPBal
+ SUM(case when type = 'IS' then Qty_Issued else 0 end) OVER (ORDER BY (SELECT 1) ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW)
- SUM(case when type = 'RT' then Qty_Return else 0 end) OVER (ORDER BY (SELECT 1) ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW)
AS OPBal
FROM #TT
--- IF you want to order records by [Date] & issued_id then apply this logic
SELECT [Date],Issued_Id, Item_Name, Qty_Issued, Qty_Return, Qty_Damage, Type, Balance,
OPBal
+ SUM(case when type = 'IS' then Qty_Issued else 0 end) OVER (ORDER BY [Date] ASC, issued_id ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW)
- SUM(case when type = 'RT' then Qty_Return else 0 end) OVER (ORDER BY [Date] ASC, issued_id ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW)
AS OPBal
,SUM(case when type = 'IS' then Qty_Issued else 0 end) OVER (ORDER BY [Date] ASC, issued_id ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW)
,SUM(case when type = 'RT' then Qty_Return else 0 end) OVER (ORDER BY [Date] ASC, issued_id ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW)
FROM #TT

Answer 5

Thanks to everyone..
I got solution using cursor and case...
DECLARE db_cursor CURSOR for select id from #Temp1;
open db_cursor
fetch next from db_cursor into #varData
while ##FETCH_STATUS=0
begin
set #LastAmt = ( select OPBal= case
when Type='IS' then #LastAmt+Qty_Issued
when type='RT' then #LastAmt-(Qty_Return+Qty_Damage)
when type='OP' then OPBal
else 0
end
from #Temp1 where id = #varData)
update #Temp1 set OPBal= #LastAmt where id = #varData
FETCH NEXT
FROM db_cursor INTO #varData
END
CLOSE db_cursor
DEALLOCATE db_cursor
select * from #Temp1