CREATE TABLE school (school_id CLOB, school_name CLOB, location CLOB, mascot CLOB, enrollment NUMBER, ihsaa_class CLOB, ihsaa_football_class CLOB, county CLOB)
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)

How many donors have endowment for school named 'Glenn'?
SELECT COUNT(DISTINCT T1.donator_name) FROM endowment AS T1 JOIN school AS T2 ON T1.school_id = T2.school_id WHERE T2.school_name = "Glenn"
SELECT COUNT(DISTINCT "T1"."donator_name") FROM "endowment" "T1" JOIN "school" "T2" ON "Glenn" = "T2"."school_name" AND "T1"."school_id" = "T2"."school_id"