Access - fewer records after left join tablea and tableb

I create a left join - from tablea to tableb. I am having a reverse situation than a previous question asked - how can it be that i have fewer records in tablea after the join than before.

tablea has 100 records. i join on tableb on last name and first name, and now tablea indicates 90 records.

The join indicates to have all records in tablea, and only those in tableb that are a match to tablea.

Hope this makes sense.

Thank you
exp vgAsked:
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Dale FyeOwner, Developing Solutions LLCCommented:
Post your SQL, I'm sure it has to do with the way you did the join or an associated WHERE clause.
exp vgAuthor Commented:
SELECT [TRI 2015].[Last Name], [TRI 2015].[First Name ]
FROM [TRI 2015] LEFT JOIN [TRI MAY PAYOUT] ON ([TRI 2015].[First Name ] = [TRI MAY PAYOUT].[First Name]) AND ([TRI 2015].[Last Name] = [TRI MAY PAYOUT].[Last Name])
GROUP BY [TRI 2015].[Last Name], [TRI 2015].[First Name ];
Dale FyeOwner, Developing Solutions LLCCommented:
The left join looks right, but the Group By clause is the likely cause of the reduced number of records.  Get rid of the Group By clause and see what you end up with.  If that looks like the correct number of records, then you need to run another query to identify the duplicates in your [TRI 2015] table.

But why perform the LEFT JOIN at all if you are not going to display some of the information from [Tri May Payout]?

BTW, the fact that you have a tables named [TRI 2015] and [TRI MAY Payout] indicates that you may have a bigger problem.  Do you have these [TRI YYYY] tables for multiple years or payout tables for each month?  If so, you need to rethink your data design drastically!

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exp vgAuthor Commented:
Thank you.
Dale FyeOwner, Developing Solutions LLCCommented:
glad to help.

Have you considered my comment about tables with years and month in their names?  This is really bad database design because it requires you to create new tables, forms, queries, and reports as you move forward.  Ideally, you would simply add an extra column (Tri_Year) to your [TRI] table and maybe two ([Tri_Year] and [Tri_Month]) to your [TRI Payout] tables.  This would give you the ability to use the same tables forever by simply filling in the Year and Month columns in those tables.

Failure to do this early in your project will eventually lead to headaches!
exp vgAuthor Commented:
Yes - I have considered your suggestion, and am looking into this. How I manage works for now - but  I am all open to suggestions that will help in the future.
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