how many body builder id are there
select count ( * ) from body_builder
ok,list out the body builder name
select t2.name from body_builder as t1 join people as t2 on t1.people_id = t2.people_id
ok, name the body builders whose total score is higher than 250
select t2.name from body_builder as t1 join people as t2 on t1.people_id = t2.people_id where t1.total > 250