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Distinct custnumbers in query

Author

Topic

RichardSteele
Posting Yak Master

160 Posts

Posted - 2008-05-19 : 17:21:19

Here's my query:

Select portfolio, custnumber from table

some custnumbers are the same. However I only want the query to include one portfolio per custnumber, ideally the first portfolio.

How would I accomplish this?

Many thanks!

tkizer
Almighty SQL Goddess

38200 Posts

Posted - 2008-05-19 : 17:23:18

SELECT MIN(portfolio), custnumber
FROM table
GROUP BY custnumber

Tara Kizer
Microsoft MVP for Windows Server System - SQL Server
http://weblogs.sqlteam.com/tarad/

Database maintenance routines:
http://weblogs.sqlteam.com/tarad/archive/2004/07/02/1705.aspx

RichardSteele
Posting Yak Master

160 Posts

Posted - 2008-05-19 : 18:45:23

Great, thanks. Now is there a way to randomize the portfolio that is retrieved for a particular custnumber while keeping the custnumber distinct?

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2008-05-20 : 00:01:15

quote:
Originally posted by RichardSteele

Great, thanks. Now is there a way to randomize the portfolio that is retrieved for a particular custnumber while keeping the custnumber distinct?

If you're using sql 2000:-

declare @temp table
(id int identity (1,1),
customerno int,
portfolio varchar(20),
other fields...
) 
insert into @temp (customerno,portfolio,...)
select customerno,portfolio,otherfields,...
from yourtable  
order by newid()


select t1.* from @temp t1
inner join (select customerno,min(id) as minid
            from @temp
            group by customerno)t2
on t2.customerno=t1.customerno
and t1.id=t2.minid

if in sql 2005:-

SELECT *
FROM
(SELECT ROW_NUMBER OVER(PARTITION BY customerno ORDER BY newid()) AS RowNo,*
FROM YourTable)t
WHERE t.RowNo=1

RichardSteele
Posting Yak Master

160 Posts

Posted - 2008-05-20 : 04:13:03

Thank you so much! That row_number() function is a fantastic new feature of 2005!

RichardSteele
Posting Yak Master

160 Posts

Posted - 2008-05-20 : 04:40:59

One last question, can I use an inner join in this new sql 2005 query? I want to pull the customer's name from another table that also has a key field custnumber.

visakh16
Very Important crosS Applying yaK Herder

52326 Posts

Posted - 2008-05-20 : 05:18:35

quote:
Originally posted by RichardSteele

One last question, can I use an inner join in this new sql 2005 query? I want to pull the customer's name from another table that also has a key field custnumber.

yup you can. Just inner join to your other table based on linking column. Are you sure you dont have multiple records in other table for same linking column value? in which case the data will still duplicate.

RichardSteele
Posting Yak Master

160 Posts

Posted - 2008-05-20 : 10:58:10

Thanks! Got it!

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