Question

We have two mailing lists that we need to combine, and then

1. make sure there are no duplicates
   and
2. compare against a 3rd list (the unsubscribe list) and remove any names that are on that list.

I’ve tried

SELECT DISTINCT * 
  FROM [table1.EmailAddress FROM table1 union all 
        SELECT table2.Emailaddress FROM table2]. AS [email]; 

which works fine for the 1st problem. I then tried to add

where not exist (select table3.emailaddress from table3) 

to that select query, to no avail…
We’re using access 2000 ( no we won’t upgrade);
The all tables have other fields, none of which match any other tables.
Even the emailaddress fields have non matching cases…

Answer 1

select distinct email
from (
    select Email
    from Table1
    union all
    select Email
    from Table2
)x
where not exists(
    select * from table3 t3 where t3.Email=x.Email
)

If you have a case sensitive DB just LOWER() all the email columns.