จำนวนเกมหลังฤดูกาลที่ทีม Boston Red Stockings เข้าร่วมเป็นจำนวนเท่าใด? ไม่จำเป็นต้องใช้ตารางทั้งหมด
What is the total number of postseason games that team Boston Red Stockings participated in?It is not neccessary to use all the tables.
 postseason:  (team_id_winner [ VARCHAR ] team_id_loser [ VARCHAR) ]
SELECT COUNT(*) FROM (SELECT * FROM postseason AS T1 JOIN team AS T2 ON T1.team_id_winner = T2.team_id_br WHERE T2.name = 'Boston Red Stockings' UNION SELECT * FROM postseason AS T1 JOIN team AS T2 ON T1.team_id_loser = T2.team_id_br WHERE T2.name = 'Boston Red Stockings')