SQL Remove almost duplicate rows

Question

I have a table that contains unfortuantely bad data and I\'m trying to filter some out. I am sure that the LName, FName combonation is unique since the data set is small en

Answer 1

Here is a relatively simple query that uses standard SQL and does just this:

SELECT * FROM Person P
WHERE Email IS NOT NULL OR -- Take all people with non-null e-mails
      Email IS NULL AND    -- and all people with null e-mails, as long as
        NOT EXISTS         -- there is no duplicate record of the same person
          (SELECT *        -- with a non-null e-mail
           FROM Person P2 
           WHERE P2.LName=P.LName AND P2.FName=P.FName AND P2.Email IS NOT NULL)