Table: city_density
Columns: rank
incorporated_place
metropolitan_area
state
population_2010_census
land_area_mi_2
population_density_people_per_mi_2

Question: For the city whose land area was 135.09, what was the total population density?
SQL: SELECT "population_density_people_per_mi_2" FROM city_density WHERE "land_area_mi_2" = '135.09'

Question: Which major metropolitan area had a land area of 23.80?
SQL: SELECT "metropolitan_area" FROM city_density WHERE "land_area_mi_2" = '23.80'

Question: How many states had a population density of 10188.8?
SQL: SELECT COUNT("state") FROM city_density WHERE "population_density_people_per_mi_2" = '10188.8'