Question: What are the hometowns of gymnasts and the corresponding number of gymnasts?
Schema: create table gymnast (gymnast_id varchar, PRIMARY KEY (gymnast_id)); create table people (hometown varchar, people_id varchar, PRIMARY KEY (hometown))
SQL: select t2.hometown, count(*) from gymnast as t1 join people as t2 on t1.gymnast_id = t2.people_id group by t2.hometown