How many countries are there?
select count(*) from mountain
How many mountains are there in Tanzania?
select count(*) from mountain where country = 'Tanzania'
What about in Uganda?
select count(*) from mountain where country = 'Uganda'
List the times used by the climbers for those mountains.
select t1.time from climber as t1 join mountain as t2 on t1.mountain_id = t2.mountain_id where t2.country = "Uganda"