CREATE TABLE candidate (Candidate_ID INT, People_ID INT, Poll_Source TEXT, Date TEXT, Support_rate FLOAT, Consider_rate FLOAT, Oppose_rate FLOAT, Unsure_rate FLOAT)
CREATE TABLE people (People_ID INT, Sex TEXT, Name TEXT, Date_of_Birth TEXT, Height FLOAT, Weight FLOAT)

Give me the comparison about the average of Height over the Sex , and group by attribute Sex, I want to sort from low to high by the mean height.
SELECT Sex, AVG(Height) FROM people GROUP BY Sex ORDER BY AVG(Height)
SELECT "Sex", AVG("Height") FROM "people" GROUP BY "Sex" ORDER BY AVG("Height") NULLS FIRST