Table schema:
CREATE TABLE COUNTRIES (CountryName VARCHAR, Continent VARCHAR, CountryId VARCHAR); CREATE TABLE CONTINENTS (ContId VARCHAR, Continent VARCHAR); CREATE TABLE CAR_MAKERS (Country VARCHAR)

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