CREATE TABLE county_public_safety (county_id DECIMAL, name TEXT, population DECIMAL, police_officers DECIMAL, residents_per_officer DECIMAL, case_burden DECIMAL, crime_rate DECIMAL, police_force TEXT, location TEXT)
CREATE TABLE city (city_id DECIMAL, county_id DECIMAL, name TEXT, white DECIMAL, black DECIMAL, amerindian DECIMAL, asian DECIMAL, multiracial DECIMAL, hispanic DECIMAL)

Show the crime rates of counties in ascending order of number of police officers.
SELECT crime_rate FROM county_public_safety ORDER BY police_officers
SELECT "crime_rate" FROM "county_public_safety" ORDER BY "police_officers" NULLS FIRST