CREATE TABLE people (people_id NUMBER, name CLOB, height NUMBER, weight NUMBER, date_of_birth CLOB)
CREATE TABLE entrepreneur (entrepreneur_id NUMBER, people_id NUMBER, company CLOB, money_requested NUMBER, investor CLOB)

Return the investors who have invested in two or more entrepreneurs.
SELECT investor FROM entrepreneur GROUP BY investor HAVING COUNT(*) >= 2
SELECT "investor" FROM "entrepreneur" GROUP BY "investor" HAVING COUNT(*) >= 2