CREATE TABLE endowment (donator_name VARCHAR, school_id VARCHAR)
CREATE TABLE school (school_id VARCHAR, school_name VARCHAR)

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