CREATE TABLE tryout (enr NUMBER, cName VARCHAR2, pPos VARCHAR2)
CREATE TABLE college (enr NUMBER, cName VARCHAR2, pPos VARCHAR2)

What is the total number of enrollment of schools that do not have any goalie player?
SELECT SUM(enr) FROM college WHERE NOT cName IN (SELECT cName FROM tryout WHERE pPos = "goalie")
SELECT SUM("enr") FROM "college" WHERE NOT "cName" IN (SELECT "cName" FROM "tryout" WHERE "goalie" = "pPos")