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T-SQL: SUM problem involving individual rows

Posted on 2006-11-27
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Last Modified: 2008-03-10
Hi everyone,
I have a table:

Id               Value
1                10
2                20
3                40
4                10

And I want to select the Ids, Values, and the proportion of the total of the values that each individual row comprises.  Perhaps it's best illustrated: I want to do a SELECT that results in this:

Id               Value           Proportion
1                10               0.125  (10 / 80 (which is the sum of the Values column))
2                20               0.25 (20 / 80)
3                40               0.5 (40 / 80)
4                10               0.125 (10 / 80)

What's the simplest SQL that can give me these results?

Thanks!
-Mike
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Question by:bignis
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2 Comments
 
LVL 143

Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 69 total points
ID: 18022983
select id, value , value / ( select sum(value) from yourtable)
from yourtable

or:

declare @sum numeric(20,3)
select @sum = sum(value) from yourtable
select id, value , value / @sum from yourtable
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Author Comment

by:bignis
ID: 18027514
Yup, works for me.
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