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SQL to multiply values on each row and then find the average

Posted on 2008-06-26
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Last Modified: 2010-04-21
Hi there,

I have a table Customer with the following details

AcctID,  Name, Ticket, Values

1            Bob       3           20
2            Bob       3           10
3           Bob        4            5
4           Bob        5          10
5           Bob        5          10
6           Karen     6           2

What I need to do is write a SQL query to multiply the values together for each ticket and then return the Average Value per user(Name). - The Average Value is the multiplied values for each ticket divided by the number of tickets.

Please can you help me write the SQL query to return the average values per user.

Many thanks.
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Question by:ihatelag
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LVL 143

Expert Comment

by:Guy Hengel [angelIII / a3]
ID: 21873274
you mean:
select name, avg(Ticket * Values)
 from customer
group by name

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Author Comment

by:ihatelag
ID: 21874960
I need to multiply the figures in the Value column not Column Ticket and Column Values,

For example  for ticket 3 - bob has 10 * 20 in the 'Values' column  so ticket 3 = 200 from 1 ticket
then we take each ticket he has run the above formulae and then get the avarage value after multiplying the values.

Only if the query was just as simple as you wrote it ;)
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LVL 143

Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 2000 total points
ID: 21875090
it's as simple as that, with a "small" math trick:
set nocount on
declare @t table (acctID int ,  Name varchar(30), Ticket int, [Values] int)
insert into @t values(1            ,'Bob',       3         ,  20 )
insert into @t values(2            ,'Bob',       3         ,  10)
insert into @t values(3           ,'Bob',        4         ,   5)
insert into @t values(4           ,'Bob',        5         , 10)
insert into @t values(5           ,'Bob',        5         , 10)
insert into @t values(6           ,'Karen',     6          , 2)
 
-- step 1 to show the products:
select name, ticket, cast( exp(sum(log([values]))) as int) p
from @t
group by name, ticket
 
 
-- step 2 to average by user
select name, avg(p) average_value, count(*) count_tickets, sum(p) sum_product
from (
select name, ticket, cast( exp(sum(log([values]))) as int) p
from @t
group by name, ticket
) l
group by name

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Author Closing Comment

by:ihatelag
ID: 31470912
I wasn't able to apply all of the query as the table didn't just contain the lines of the example, but I used a neat the step 1 and step 2 to good use. Many thanks for your help.
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