SELECT school_name FROM school WHERE school_id NOT IN (SELECT school_id FROM endowment)
List the names of the schools without any endowment.
CREATE TABLE "School" (
"School_id" text,
"School_name" text,
"Location" text,
"Mascot" text,
"Enrollment" int,
"IHSAA_Class" text,
"IHSAA_Football_Class" text,
"County" text,
PRIMARY KEY ("School_id")
);
CREATE TABLE "budget" (
"School_id" int,
"Year" int,
"Budgeted" int,
"total_budget_percent_budgeted" real,
"Invested" int,
"total_budget_percent_invested" real,
"Budget_invested_percent" text,
PRIMARY KEY("School_id","YEAR"),
FOREIGN KEY("School_id") REFERENCES "School"("School_id")

);
CREATE TABLE "endowment" (
"endowment_id" int,
"School_id" int,
"donator_name" text,
"amount" real,
PRIMARY KEY("endowment_id"),
FOREIGN KEY("School_id") REFERENCES "School"("School_id")
);
INSERT INTO  "School" VALUES (1,"Bremen","Bremen","Lions","495","AA","AA","50 Marshall");
INSERT INTO  "budget" VALUES (2,"1999","4979","2","2134","2","42.9");
INSERT INTO  "endowment" VALUES (1,1,"Monte Plata","9.51");