Removing Duplicate Entries from Joined Tables in CrossTab Query?

[crazy_loud]

Hello all,

I have made a crosstab query that is sporatically making duplicate counts. I'd like to know how to fix the problem, but more importantly - I'd like to know why and how my query is giving me these results so I can avoid making this same mistake again.

The relationship is set up so that all records from one table are returned, with only matching records from the other - so no problems that way as far as I can see. This is my crosstab query that is giving some counts of the same record as being matched sometimes two, three, or even four times:

TRANSFORM
Count([Testing DB].[DB_ID]) AS [CountOfDB_ID]

SELECT
[Testing DB].State, [Location].[North], Count([Testing DB].[DB_ID])
AS [Total Of DB_ID]

FROM [Testing DB] LEFT JOIN [Location] ON [Testing DB].[Address] = [Location].Address

WHERE (([Testing DB].[Window Length]) Is Not Null))

GROUP BY [Testing DB].State, [Location].[Size]

ORDER BY [Testing DB].State, [Location].[Size]

PIVOT Format([Date],"mmm-yyyy");

When I do a simple query for a list of the records being counted by this query, I can see the duplicate entries and can eliminate them simply by adding "Distinct" to the select statement - but I haven't had any luck adding any kind of distinction with this crosstab that will do the same.

How can I eliminate duplicate counts of records in my crosstab? If anyone has a suggestion, it would be much appreciated.

 

[crazy_loud]

For reference - I'm going to try doing this with two queries and a UNION clause, and will post back if successful.