CREATE TABLE member_of_club (clubid VARCHAR, stuid VARCHAR)
CREATE TABLE student (age INT, stuid VARCHAR)
CREATE TABLE club (clubid VARCHAR, clubname VARCHAR)

What is the average age of the members of the club 'Bootup Baltimore'?
SELECT AVG(t3.age) FROM club AS t1 JOIN member_of_club AS t2 ON t1.clubid = t2.clubid JOIN student AS t3 ON t2.stuid = t3.stuid WHERE t1.clubname = "Bootup Baltimore"
SELECT AVG("t3"."age") FROM "club" AS "t1" JOIN "member_of_club" AS "t2" ON "t1"."clubid" = "t2"."clubid" JOIN "student" AS "t3" ON "t2"."stuid" = "t3"."stuid" WHERE "Bootup Baltimore" = "t1"."clubname"