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

find the name of people whose height is lower than the average.
SELECT name FROM people WHERE height < (SELECT AVG(height) FROM people)
SELECT "name" FROM "people" WHERE "height" < (SELECT AVG("height") FROM "people")