อายุขัยเฉลี่ยของผู้เล่นหอเกียรติยศไม่จำเป็นต้องใช้ทุกโต๊ะ
Average lifespan of hall of fame playersIt is not neccessary to use all the tables.
 salary:  year [ number]  team_id [ text]  league_id [ text]  player_id [ text]  salary [ number] 
SELECT AVG(T1.death_year - T1.birth_year) FROM player AS T1 JOIN hall_of_fame AS T2 ON T1.player_id = T2.player_id WHERE T2.inducted = "Y"