What are the names and ids of all stations that have more than 14 bikes available on average or had bikes installed in December?
select t1.name, t1.id from station as t1 join status as t2 on t1.id = t2.station_id group by t2.station_id having avg(t2.bikes_available) > 14 union select name, id from station where installation_date like "12/%"