troubleshooting Question

Do null values adversely affect join properties in Access 2010?

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Liberty4allFlag for United States of America asked on
Microsoft AccessRESTSQL
20 Comments1 Solution220 ViewsLast Modified:
I have a query that joins two tables using three fields in Access 2010.  The fields used in the inner joins have identical data types.  When joining to only two of the three fields the query returns five records but when adding the third join nothing is returned.  Of the five records returned, only one is populated for the field CommitteeName in one table and the rest are null.  I can understand why that record is not returned when adding a third join but don't understand why the other four should be excluded.  The data type of the field in both tables is text and Allow Zero Length = Yes.  

I ran the following query to replace all blanks with null in both tables thinking this would solve it but no change in results occurred.
UPDATE tblBoardCommitteeImport1F SET tblBoardCommitteeImport1F.CommitteeName = Null
WHERE (((Nz([tblBoardCommitteeImport1F].[CommitteeName],''))=''));

I'm guessing the problem has to do with null values in the CommitteeName field in one or both tables but am not sure what to try next.  Any advice on how to troubleshoot this further would be appreciated.
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