Database: car_1
Question: Which countries in europe have at least 3 car manufacturers?
SQL: select t1.countryname from countries as t1 join continents as t2 on t1.continent  =  t2.contid join car_makers as t3 on t1.countryid  =  t3.country where t2.continent  =  'europe' group by t1.countryname having count(*)  >=  3;