How many podcast reviews with a rating of 3 were created during the first quarter of 2015?
rating of 3 refers to rating = 3; created during the first quarter of 2015 refers to created_at BETWEEN'2015-01-01T00:00:00-07:00' and '2015-03-31T23:59:59-07:00'
SELECT COUNT(podcast_id) FROM reviews WHERE rating = 3 AND created_at BETWEEN '2015-01-01T00:00:00-07:00' AND '2015-03-31T23:59:59-07:00'