Heights of the body builders
select t2.height from body_builder as t1 join people as t2 on t1.people_id = t2.people_id
Total score
select t1.total from body_builder as t1 join people as t2 on t1.people_id = t2.people_id
Show me the heights of body builders with total score smaller than 315
select t2.height from body_builder as t1 join people as t2 on t1.people_id = t2.people_id where t1.total < 315