List the countries more than two swimmer?
select nationality from swimmer group by nationality having count ( * ) > 2
what is the name of swimmer with id 5?
select name from swimmer where id = 5
whats is nationality of the craif colbertaldo?
select nationality from swimmer where name = "craif colbertaldo"
how many swimmer in the list?
select count ( id ) from swimmer
what is the name of the swimmer id 4?
select name from swimmer where id = 4