sum and carry forward values

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5.00/5 (1 vote)

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SQL-Server-2005

Hi,
I would like to use SUM or any other function to sum a series of
records as in the following example.

I have this table T1

Col1 Col2
1 20
2 10
1 10
2 5
1 20
3 10

and would like to obtain this result from a query

Col1 Col2 Col3
1 20 20
1 10 30
1 20 50
2 10 10
2 5 15
3 10 10

Column Col3 should carry forward and sum values from Col2

Posted 29-Oct-12 1:48am

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damodara naidu betha · Answer 1 · 2012-10-29T21:27:00

Hi,

Try this...

SQL

DECLARE @TblVariable Table
(
  col1 INT,
  col2 INT
);

INSERT INTO @TblVariable VALUES
(1,20),
(2,10),
(1,10),
(2,5),
(1,20),
(3,10);

With tblCTE as
(
Select Row_Number() OVER (Order by col1) as RowNumber,col1,col2 from @TblVariable
)

SELECT Col1,Col2,
( SELECT SUM(Col2) FROM tblCTE T2 WHERE T2.RowNumber <= T1.RowNumber 
  AND T1.Col1 = T2.Col1 GROUP BY Col1
) AS Col3 FROM tblCTE T1 GROUP BY Col1,Col2,RowNumber
ORDER BY Col1, RowNumber

Thank you..

VIPR@T · Answer 2 · 2012-10-29T01:55:00

Solution 1

Hi,

See the below links.
It might be help you.

Query for running total in SQL Server[^]

Query for running total in SQL Server[^]

Posted 29-Oct-12 1:55am

VIPR@T

Comments

[no name] 29-Oct-12 7:58am

But i m having a single table and the number of columns are 3..can u plz give some some example by putting some values

Bitla Phanindra · Answer 3 · 2012-10-29T02:01:00

Solution 2

Try using a correlated subquery.

SQL

select
a.Col1, a.Col2, 
(
select sum(b.Col2)
from t as b
where b.Col1 = a.Col1
) as col3 
from 
t as a;
GO

You can also do it with a self-join:

SQL

select a.Col1,a.Col2,sum(b.Col2) as Col3
from T1 as a
inner join T1 as b on b.Col1=a.Col1 
group by a.Col1,a.Col2

but I supppose the performance will be slightly worse (depends on additional filter criteria).

Posted 29-Oct-12 2:01am

Bitla Phanindra

Comments

[no name] 29-Oct-12 8:05am

Hi Bitla: please check this question in the given link and plz help me out in that
http://www.codeproject.com/Questions/485430/needplushelpplusinplusaddingplustheplusvaluespluso

__TR__ · Answer 4 · 2012-10-29T02:09:00

Here is a sample approach.

SQL

CREATE TABLE #Temp
(
	ID INT IDENTITY(1,1),
	Col1 INT,
	Col2 INT
)

INSERT INTO #Temp
SELECT 1, 20 UNION ALL
SELECT 2, 10 UNION ALL
SELECT 1, 10 UNION ALL
SELECT 2,  5 UNION ALL
SELECT 1, 20 UNION ALL
SELECT 3, 10



SELECT Col1,Col2,
(
SELECT SUM(Col2) FROM #Temp T2
WHERE T2.ID <= T1.ID AND T1.Col1 = T2.Col1
GROUP BY Col1
) AS Col3
FROM #Temp T1
GROUP BY Col1,Col2,ID
ORDER BY Col1, ID

DROP TABLE #Temp

Hope this helps.

sum and carry forward values

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