MS Access Query Help Needed

I have a query that can return one, two or three records. I need to query this query based on comparison of two fields (Field1, Field2).

Field1 always has data (text).
Field2 can have data (text) or be null.

Possible returns from the query are:
     One record returned:
          1.   Field2 is null
     Two records returned:
          1.   Field1 = Field2
          2.   Field2 is null
     Three records returned:
          1.   Field1 = Field2
          2.   Field2 is null
          3.   Field1 <> Field2

Of these possible scenarios, I need the new query to return the single record indicated by the number 1.

Can someone provide a solution?

Thanks in advance,

Tim
Tim313Asked:
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SharathData EngineerCommented:
Can you porovide some sample data from the table and expected result? I did not understand your scenarios completely.
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Tim313Author Commented:
Thanks for the reply,

The query can return a set of results which may have one row, two rows or three rows as shown:

Result -1 record returned        Result - 2 records returned        Result - 3 records returned

            Field1   Field2                                 Field1     Field2                          Field1     Field2
Row1      A       <Null>                      Row1     A             A                  Row1      A             A
                                                            Row2     A         <Null>             Row2      A         <Null>
                                                                                                                Row3      A             B

I need a new query to query the above possible results so I get 1 record returned as follows:

If  ([Field1] = A and [Field2] = A)  then return this record only.

If no ([Field1] = A and [Field2] =A) in the set, then return ([Field1] = A and IsNull([Field2]))

I do not want ([Field1] = A and [Field2] = B) to be returned.

Tim
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SharathData EngineerCommented:
try this query.
select *
  from your_table
 where Field1 = Field2 or Field2 is null

Open in new window

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Tim313Author Commented:
Thanks for your reply Sharath_123,

If the first query returned 2 or 3 records, the criteria "where Field1 = Field2 or Field2 is null" in the second query would return 2 records:

     Field1 = A, Field2 = A     AND     Field1 = A, IsNull(Field2)

I'm thinking the WHERE needs to be more specific... possibly needing nested "IIf" statements.

Tim
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SharathData EngineerCommented:
Post some sample data and the expected result. That will really help.
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Tim313Author Commented:
Found the solution:

WHERE (IIf(EXISTS(SELECT * FROM query1 WHERE Field1=Field2), Field1=Field2, Field2=""))
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Tim313Author Commented:
I found the correct solution before any correct solution was submitted by others.
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