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
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LVL 25

Expert Comment

Comment Utility
Hi twands,


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

LVL 75

Expert Comment

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

Author Comment

Comment Utility

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

Comment Utility
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
Comment Utility

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

Comment Utility
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.

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