>I need to find potentially duplicate records in my membership database. The search needs to do the following:
>Look at all records with a system assigned ssn (our system assigned numbers start with "000") and compare them to all other records to check for people with the same last name living in the same city. I have created a subset table containing only the records with system assigned ssns, but I am sort of scratching my head as to what to do next. The main table is unavailable to me for esclusive use... should I copy it in order to create additional indexes to search on? Is there a single SQL statement that would take care of this? Thanks in advance for any help.

Erik:

I have followed this entire thread. Have you tried Barbara's solution? That should get what you need with minimal number of records in results set. The SQL joins your membership table to the subset table with the system ID records retrieves the recs with matching lastname+city with a count greater than 1.