CREATE TABLE player (pid NUMBER, pname CLOB, ycard CLOB, hs NUMBER)
CREATE TABLE tryout (pid NUMBER, cname CLOB, ppos CLOB, decision CLOB)
CREATE TABLE college (cname CLOB, state CLOB, enr NUMBER)

Find the average hours for the students whose tryout decision is no.
SELECT AVG(T1.hs) FROM player AS T1 JOIN tryout AS T2 ON T1.pid = T2.pid WHERE T2.decision = 'no'
SELECT AVG("T1"."hs") FROM "player" "T1" JOIN "tryout" "T2" ON "T1"."pid" = "T2"."pid" AND "T2"."decision" = 'no'