Remove duplicate rows leaving oldest row Only?

Question

I have a table of data and there are many duplicate entries from user submissions.

I want to delete all duplicates rows based on the field subscriberEmail

Answer 1

If you have a unique id for each row, you can try something like this. Don't ask me why exactly you need the second select statement, mysql won't let me execute otherwise. Also, group by whatever columns make your results unique.

delete from my_table where id in (
  select id from (
    select id from my_table a group by subscriberEmail having count(*) > 1
  ) b
);