ความสูงเฉลี่ยของผู้เล่นจากวิทยาลัยชื่อ 'Yale University' คือเท่าใด?ไม่จำเป็นต้องใช้โต๊ะทั้งหมด
What is the average height of the players from the college named 'Yale University'?It is not neccessary to use all the tables.
 player_college:  (player_id [ VARCHAR ] college_id [ VARCHAR) ]
SELECT AVG(T1.height) FROM player AS T1 JOIN player_college AS T2 ON T1.player_id = T2.player_id JOIN college AS T3 ON T3.college_id = T2.college_id WHERE T3.name_full = 'Yale University'