How many mountains in this table?
select count ( * ) from mountain
Show the distinct names of mountains climbed by climbers from country "West Germany".
select distinct t2.name from climber as t1 join mountain as t2 on t1.mountain_id = t2.mountain_id where t1.country = "West Germany"
Please show me the name of the highest mountain.
select name from mountain order by height desc limit 1