CREATE TABLE person (name CLOB, age NUMBER, city CLOB, gender CLOB, job CLOB)
CREATE TABLE personfriend (name CLOB, friend CLOB, year NUMBER)

What are the names of all of Bob's friends?
SELECT T1.name FROM person AS T1 JOIN personfriend AS T2 ON T1.name = T2.name WHERE T2.friend = 'Bob'
SELECT "T1"."name" FROM "person" "T1" JOIN "personfriend" "T2" ON "T1"."name" = "T2"."name" AND "T2"."friend" = 'Bob'