t-sql SUM

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t-sql SUM

erdem1973

SSCommitted

Points: 1843
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February 25, 2010 at 1:41 am

#217265

Hello Experts,
My database table and its data as follows:
CREATE TABLE TEST
(
lfisno int,
Stockcode varchar(50),
quantity int
-- rate float
)
INSERT INTO TEST values (1,'A',50)
go
INSERT INTO TEST values (1,'B',100)
go
INSERT INTO TEST values (2,'C',20)
go
INSERT INTO TEST values (2,'D',50)
go
INSERT INTO TEST values (2,'C',30)
go
I want to create a new database view that consist a new column named "Rate". Rate is the proportion of the Quantity columns for each lfisno.
My desired resultset is:
lfisno StockCode Quantity Rate
1 A 50 0.33
1 B 100 0.66
2 C 50 0.50
2 D 50 0.50
For example the rate value for the stockcode A is = 50/100=0.33
Please help

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Ken McKelvey SSCoach Points: 18856 More actions · Answer 1

SELECT lfisno, Stockcode, quantity

,CAST(quantity * 1.0 / SUM(quantity) OVER (PARTITION BY lfisno) AS decimal(6,2))AS rate

FROM

(

SELECT lfisno, Stockcode

,SUM(quantity) AS quantity

FROM test

GROUP BY lfisno, Stockcode

) D

Adi Cohn-120898 SSC-Dedicated Points: 33944 More actions · Answer 2

Here is one way:

with MyCTE as (

select lfisno, sum(quantity) as QuantityPerlfisno

from TEST

group by lfisno)

select T.lfisno, Stockcode, quantity, convert(real,quantity)/M.QuantityPerlfisno as rate

from TEST T inner join MyCTE M on T.lfisno = M.lfisno

Adi

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erdem1973 SSCommitted Points: 1843 More actions · Answer 3

Thank you very much for your replies.

I have solved the issue with your help..

Jeff Moden SSC Guru Points: 1004406 More actions · Answer 4

erdem1973 (2/25/2010)
Thank you very much for your replies.
I have solved the issue with your help..

Would you post your final code, please?

--Jeff Moden

RBAR is pronounced "ree-bar" and is a "Modenism" for Row-By-Agonizing-Row.
First step towards the paradigm shift of writing Set Based code:
________Stop thinking about what you want to do to a ROW... think, instead, of what you want to do to a COLUMN.

Change is inevitable... Change for the better is not.

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