How to Decrement value column by previous row in select sql statement

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How to Decrements value column by previous row in select sql statement

for ex in tabl

name  qty     open qty
aaa  1200     1500
bbb   2000    5000
aaa    200

and sql query i want to add temp values .

name qty total
aaa  1200 300
bbb  2000 3000
aaa  200  100

this is openqty - previous qty
here total is temporary variable..

Posted 24-Jul-13 2:27am

rajkumar_k88

Updated 16-Mar-16 10:58am

Maciej Los

v2

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Savalia Manoj M 24-Jul-13 8:48am

i can not understand your question. Please specify with proper example.

1 solution

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Maciej Los · Answer 1 · 2013-07-24T02:58:00

Solution 1

Try this:

SQL

DECLARE @tmp TABLE([name] VARCHAR(30), [qty] INT, [open qty] INT NULL) 

INSERT INTO @tmp ([name], [qty], [open qty])
SELECT 'aaa',  1200, 1500
UNION ALL SELECT 'bbb', 2000, 5000
UNION ALL SELECT 'aaa', 200, 300

SELECT [name], [qty], [open qty], [open qty]- [qty]  AS [total]
FROM @tmp

Result:

name    qty     open q. total
aaa	1200	1500	300
bbb	2000	5000	3000
aaa	200	300	100

Posted 24-Jul-13 2:58am

Maciej Los

Comments

Herman<T>.Instance 24-Jul-13 10:38am

CTE solution?

Maciej Los 24-Jul-13 11:19am

No, it's not.

Herman<T>.Instance 26-Jul-13 4:40am

If a CTE could be more handy in this case, that was the intended question.

Maciej Los 26-Jul-13 4:51am

I don't think so that CTE is more handy in this case. It's simple subtraction...