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

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")