Solved

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

Posted on 2008-06-26
4
1,324 Views
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.
0
Comment
Question by:ihatelag
  • 2
  • 2
4 Comments
 
LVL 142

Expert Comment

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

Open in new window

0
 

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 ;)
0
 
LVL 142

Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 500 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

Open in new window

0
 

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.
0

Featured Post

Backup Your Microsoft Windows Server®

Backup all your Microsoft Windows Server – on-premises, in remote locations, in private and hybrid clouds. Your entire Windows Server will be backed up in one easy step with patented, block-level disk imaging. We achieve RTOs (recovery time objectives) as low as 15 seconds.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Title # Comments Views Activity
multiple application databases same MSSQL instance 5 53
SQL Server Designer 19 39
sql server concatenate fields 10 31
SQL SELECT query help 7 33
Introduction SQL Server Integration Services can read XML files, that’s known by every BI developer.  (If you didn’t, don’t worry, I’m aiming this article at newcomers as well.) But how far can you go?  When does the XML Source component become …
Why is this different from all of the other step by step guides?  Because I make a living as a DBA and not as a writer and I lived through this experience. Defining the name: When I talk to people they say different names on this subject stuff l…
Via a live example combined with referencing Books Online, show some of the information that can be extracted from the Catalog Views in SQL Server.
Via a live example, show how to setup several different housekeeping processes for a SQL Server.

786 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question