which musical ids showed up at least three times in the actor table?
select t2.musical_id from actor as t1 join musical as t2 on t1.musical_id = t2.musical_id group by t1.musical_id having count ( * ) > = 3
What year is that musical with id 6?
select distinct ( t2.year ) from actor as t1 join musical as t2 on t1.musical_id = t2.musical_id where t2.musical_id = 6
And what's the name for that musical with ID 6?
select distinct ( t2.name ) from actor as t1 join musical as t2 on t1.musical_id = t2.musical_id where t2.musical_id = 6