CREATE TABLE Person (name VARCHAR(255), age VARCHAR(255)); CREATE TABLE PersonFriend (name VARCHAR(255), friend VARCHAR(255))
Find the name and age of the person who is a friend of both Dan and Alice.
    
SQL: SELECT T1.name, T1.age FROM Person AS T1 JOIN PersonFriend AS T2 ON T1.name = T2.name WHERE T2.friend = 'Dan' INTERSECT SELECT T1.name, T1.age FROM Person AS T1 JOIN PersonFriend AS T2 ON T1.name = T2.name WHERE T2.friend = 'Alice'