Database: bbc_channels
Question: give me the name of channels that have both a director younger than 40 and a director older than 60.
SQL:
SELECT t1.name FROM channel AS t1 JOIN director_admin AS t2 ON t1.channel_id  =  t2.channel_id JOIN director AS t3 ON t2.director_id  =  t3.director_id WHERE t3.age  <  40 INTERSECT SELECT t1.name FROM channel AS t1 JOIN director_admin AS t2 ON t1.channel_id  =  t2.channel_id JOIN director AS t3 ON t2.director_id  =  t3.director_id WHERE t3.age  >  60