Query of distinct values

Posted on 2009-05-07
Last Modified: 2013-11-27
I have a table that has the following values:
ID     Person      Units
128   Greg        8
129   Greg        10
130   Greg         5
131   Greg         6
131   Greg         4
132   Sally         10
133   Sally         5
133   Sally         8
133   Sally         15

I need to write a query that will sum up by person the number of unique Id's and the total number of units.
In this case, it should show:
     Greg     4 (id's)   33 (units)
     Sally     2 (id's)   38 (units)

The kicker is that the id's are not unique, so I need a count of the unique records for each person , but the sum of the units must contain all of the units.


Question by:twands
  • 3
  • 2
LVL 25

Expert Comment

ID: 24332753
Hi twands,


SELECT Person, count(distinct ID) as idcnt, SUM(Units)
FROM yourtable

LVL 75

Expert Comment

by:Aneesh Retnakaran
ID: 24332758
select Person, sum(units) as totl
from urTable
group by Person

Author Comment

ID: 24332813

I have tried your solution, but to my knowledge "count(distinct ID) as idcnt" is not supported in access.  It returns an error.
Resolve Critical IT Incidents Fast

If your data, services or processes become compromised, your organization can suffer damage in just minutes and how fast you communicate during a major IT incident is everything. Learn how to immediately identify incidents & best practices to resolve them quickly and effectively.


Author Comment

ID: 24332818
Your solution gives me the person and number of units but not the count of unique record id's.
LVL 25

Accepted Solution

lwadwell earned 250 total points
ID: 24332838

OK ... that is a shame ... try this (not very nice I must admit)

SELECT t1.Person, t2.idcnt, SUM(t1.Units)
FROM yourtable t1
INNER JOIN (SELECT v1.Person, COUNT(*) as idcnt FROM (SELECT DISTINCT Person, ID FROM yourtable) v1 GROUP BY v1.Person) t2
ON t1.Person = t2.Person
GROUP BY t1.Person, t2.idcnt


Author Closing Comment

ID: 31579298
Thanks much!  With a few minor tweaks, I was able to incorpoarte your solution into my query and it gives me what I was looking for.

Featured Post

Master Your Team's Linux and Cloud Stack

Come see why top tech companies like Mailchimp and Media Temple use Linux Academy to build their employee training programs.

Question has a verified solution.

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

If you have heard of RFC822 date formats, they can be quite a challenge in SQL Server. RFC822 is an Internet standard format for email message headers, including all dates within those headers. The RFC822 protocols are available in detail at:   ht…
This article describes how to use the timestamp of existing data in a database to allow Tableau to calculate the prior work day instead of relying on case statements or if statements to calculate the days of the week.
In Microsoft Access, learn how to use Dlookup and other domain aggregate functions and one method of specifying a string value within a string. Specify the first argument, which is the expression to be returned: Specify the second argument, which …
Polish reports in Access so they look terrific. Take yourself to another level. Equations, Back Color, Alternate Back Color. Write easy VBA Code. Tighten space to use less pages. Launch report from a menu, considering criteria only when it is filled…

856 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