Remove duplicate instructor listings

[nathanmsmith]

There are some duplicate instructor listings:

select id, first_names, last_names from instructors where first_names in (select first_names from instructors group by first_names, last_names having count(*) > 1) and last_names in (select last_names from instructors group by first_names, last_names having count(*) > 1) and array_length(first_names,1) > 0 order by first_names, last_names;