Table schema:
CREATE TABLE school (school_id VARCHAR, school_name VARCHAR); CREATE TABLE endowment (donator_name VARCHAR, school_id VARCHAR)

Question: Show the names of donors who donated to both school "Glenn" and "Triton."
SQL: SELECT T1.donator_name FROM endowment AS T1 JOIN school AS T2 ON T1.school_id = T2.school_id WHERE T2.school_name = 'Glenn' INTERSECT SELECT T1.donator_name FROM endowment AS T1 JOIN school AS T2 ON T1.school_id = T2.school_id WHERE T2.school_name = 'Triton'