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"
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 as t1 join school as t2 on t1 . school_id = t2 . school_id where t2 . school_name = value
How many donors have endowment for school named `` Glenn '' ?