-- Database schema
| Person : name [ TEXT ] primary_key , age [ INT ] , city [ TEXT ] , gender [ TEXT ] , job [ TEXT ] | PersonFriend : name [ TEXT ] PersonFriend.name = Person.name , friend [ TEXT ] PersonFriend.friend = Person.name , year [ INT ] |
-- -- What is the total number of people who have no friends living in Austin?

SELECT count(DISTINCT name) FROM PersonFriend WHERE friend NOT IN (SELECT name FROM person WHERE city  =  'Austin');