What is the zip code of county id of 2
select zip_code from county where county_id = 2
how much population of zip code D21?
select population from county where zip_code = "D21"
what is the county name zip code D02?
select county_name from county where zip_code = "D02"
what is election id of district 2?
select election_id from election where district = 2
how many distinct delegates are from counties with population larger than 50000
select count ( distinct t2.delegate ) from county as t1 join election as t2 on t1.county_id = t2.district where t1.population > 50000