CREATE TABLE candidate (candidate_id DECIMAL, people_id DECIMAL, poll_source TEXT, date TEXT, support_rate DECIMAL, consider_rate DECIMAL, oppose_rate DECIMAL, unsure_rate DECIMAL)
CREATE TABLE people (people_id DECIMAL, sex TEXT, name TEXT, date_of_birth TEXT, height DECIMAL, weight DECIMAL)

Return the top 3 greatest support rates.
SELECT support_rate FROM candidate ORDER BY support_rate DESC LIMIT 3
SELECT "support_rate" FROM "candidate" ORDER BY "support_rate" DESC NULLS LAST LIMIT 3