Hello!  Can you show me a list of all of the hometowns?
select hometown from people
Thank you!  Can you filter this list ot show only the hometowns that have both people older than 23 years of age and people younger than 20 years of age?
select hometown from people where age > 23 intersect select hometown from people where age < 20
Excellent!  Can you tell me how many people in total have Santo Domingo as their Hometown?
select count ( * ) from people where hometown = "Santo Domingo"