text: --Excercise #1--
  SELECT pfirstname, pfavorites -> 'Desserts' FROM people LIMIT 10;
  --Excercise #2--
  SELECT pfirstname AS "First Name", pfavorites @> CAST('{"Desserts": ["cake"]}' AS JSONB) FROM people;
  -- Exercise #3
  SELECT pfirstname, (pfavorites -> 'Desserts') ? 'ice cream' FROM people;