Question : Find Duplicate Query

Dear Experts,

I am building a database that is designed to find potential duplicates from another contact (non access) database. In order to do this I have imported the records into Access into a table TBL-Master and built a Find Duplicates Query" using the wizard. This works, but can only look up duplicates based on one field.

My criteria for determining a duplicate is a match in a persons email address. The problem is that there are 2 fields for email addresses [email] and [email_2] & I would like to have the query look for duplicates across both field (i.e. a matching email address for Jo Bloggs may be found in 1 record in [email] and for another in [email_2]

The query statement Im currently using is as follows:

In (SELECT [email] FROM [TBL-Master] As Tmp GROUP BY [email],[email_2] HAVING Count(*)>1 And [email_2] = [TBL-Master].[email_2])

Can anyone help?

Answer : Find Duplicate Query

Use the following query. I have further tuned it and now I could run it in < 3 sec.

                       
         
           
           
             SELECT A.email, A.email_2, A.firstname, A.lastname, A.people_ref, A.people_ref_no, A.name, A.title
FROM [TBL-Master] A, 
(
SELECT TMP 
FROM (SELECT TMP FROM (SELECT [email] AS TMP FROM [TBL-Master] where [email] is not null UNION ALL SELECT [email_2] AS TMP FROM [TBL-Master] where [email_2] is not null) AS TT GROUP BY TMP HAVING COUNT(*) > 1)
) AS B
WHERE
A.email = B.TMP
OR 
A.email_2 = B.TMP
ORDER BY A.email, A.email_2

           
         

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