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
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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.
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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.

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