What sports information is there on students under the age of 20?
select * from sportsinfo as t1 join student as t2 on t1.stuid = t2.stuid where t2.age < 20
How many hours per week do they practice in total?
select sum(hoursperweek) from sportsinfo as t1 join student as t2 on t1.stuid = t2.stuid where t2.age < 20
Also, how many games do they play overall?
select sum(hoursperweek), sum(gamesplayed) from sportsinfo as t1 join student as t2 on t1.stuid = t2.stuid where t2.age < 20