NOT Counting Duplicates

Jun 13, 2006

Hello everyone,

I have been working on a database that involves Clients and Group Meetings. I have a table for Clients (which includes their ID, Name, ect) and also a table for Groups(Group ID,Name,ect).This is set to keep the attendance of each group meeting.

I would like to do a count of all the members that belong to each group. Right now I have the query set to count the Client ID with a group by of the Group name. This ends up counting a Client ID more than once each time they attend that groups meeting. Once the client belongs to a group I would like it to not count them more than once.

It's probably something simple that I'm overlooking. I have showed other people and nobody has had any answers about being able to a count without counting duplicates.

Here is my SQL:

SELECT DISTINCT Count([tblMaster-GroupMeetDates].ClientID) AS CountOfClientID, [tblMaster-Group].GroupName
FROM [tblMaster-Group] INNER JOIN [tblMaster-GroupMeetDates] ON [tblMaster-Group].GroupId = [tblMaster-GroupMeetDates].GroupId
GROUP BY [tblMaster-Group].GroupName;

Thank you to anyone that can help

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Counting No Duplicates

Jan 18, 2007

Hi guys,

I'm actually starting to use Access and I have a question about a query.
Basically I have a table that says:

ITEM ORDER CAT
A 1200 01
A 1200 02
B 1200 01
B 1100 01

I'd like to count the number of Orders per each item, without counting duplicates. The Output should be:
A = 1 Order
B = 2 Orders

But when I use the Count option on my query table under ORDER it calculates:

A = 2
B = 2

As if is counting the number of records.

How can I solve this problem?

Thanks so much


dante

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Hi,

I have a problem with getting the right result with a query.

To this topic I attached a part of my database including 2 queries. The queries are almost the same, except the first field. In query 1 is the total 'Group By' and in query 2 'Count'.The other fields are parameters, which are the same in both queries.

My problem:
If I run query 1 then the result is 31 rows with unique ID's. When I run query 2 the result is 35, because the query counts 4 duplicates.

The correct result I want is 31. That means count the unique ID's. I am able to show the ID's with query 1, but I am not able to count them correctly. I tried to add 'DISTINCT' in SQL view but that didn't help.
Also other solutions written in this forum didn't work.

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this is the basic feilds that are important in this case.

Id, data_source, data_recived, data_code,

what i want is to have a table with unique records (no dups in data_code)

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I know there is no more than 4 dups of each record.

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if anyone can help it would be great .

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