CREATE TABLE endowment (endowment_id NUMBER, school_id NUMBER, donator_name CLOB, amount NUMBER)
CREATE TABLE budget (school_id NUMBER, year NUMBER, budgeted NUMBER, total_budget_percent_budgeted NUMBER, invested NUMBER, total_budget_percent_invested NUMBER, budget_invested_percent CLOB)
CREATE TABLE school (school_id CLOB, school_name CLOB, location CLOB, mascot CLOB, enrollment NUMBER, ihsaa_class CLOB, ihsaa_football_class CLOB, county CLOB)

List the names of the schools without any endowment.
SELECT school_name FROM school WHERE NOT school_id IN (SELECT school_id FROM endowment)
SELECT "school_name" FROM "school" WHERE NOT "school_id" IN (SELECT "school_id" FROM "endowment")