list of duplicate adm2's: select title, adm2_code, count(adm2_code) from site group by adm2_code, title, adm0_code having count(adm2_code) > 1 order by count(adm2_code) desc
list of duplicate adm2's:
select title, adm2_code, count(adm2_code)
from site
group by adm2_code, title, adm0_code
having count(adm2_code) > 1
order by count(adm2_code) desc