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

Which police forces operate in both counties that are located in the East and in the West?
SELECT police_force FROM county_public_safety WHERE location = "East" INTERSECT SELECT police_force FROM county_public_safety WHERE location = "West"
SELECT "police_force" FROM "county_public_safety" WHERE "East" = "location" INTERSECT SELECT "police_force" FROM "county_public_safety" WHERE "West" = "location"