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 investor who have invested in the greatest number of entrepreneurs.
SELECT investor FROM entrepreneur GROUP BY investor ORDER BY COUNT(*) DESC LIMIT 1
SELECT "investor" FROM "entrepreneur" GROUP BY "investor" ORDER BY COUNT(*) DESC FETCH FIRST 1 ROWS ONLY