CREATE TABLE player (player_id DECIMAL, player TEXT, team TEXT, age DECIMAL, position TEXT, school_id DECIMAL)
CREATE TABLE school_performance (school_id DECIMAL, school_year TEXT, class_a TEXT, class_aa TEXT)
CREATE TABLE school_details (school_id DECIMAL, nickname TEXT, colors TEXT, league TEXT, class TEXT, division TEXT)
CREATE TABLE school (school_id DECIMAL, school TEXT, location TEXT, enrollment DECIMAL, founded DECIMAL, denomination TEXT, boys_or_girls TEXT, day_or_boarding TEXT, year_entered_competition DECIMAL, school_colors TEXT)

List the locations of schools that do not have any player.
SELECT location FROM school WHERE NOT school_id IN (SELECT school_id FROM player)
SELECT "location" FROM "school" WHERE NOT "school_id" IN (SELECT "school_id" FROM "player")