Q&A for users, experts, and developers of the Tezos blockchain project
select t.tagname from posts p join users u on u.id = p.owneruserid join posttags pt on pt.postid=p.id join tags t on t.id=pt.tagid where p.posttypeid=1 group by t.tagname having count(case when lower(u.location) like '%nigeria%' then 1 end) > 10 and count(case when lower(u.location) like '%iceland%' then 1 end) > 15