Database: concert_singer
Question: What are the names and locations of the stadiums that had concerts that occurred in both 2014 and 2015?
SQL: select t2.name ,  t2.location from concert as t1 join stadium as t2 on t1.stadium_id  =  t2.stadium_id where t1.year  =  2014 intersect select t2.name ,  t2.location from concert as t1 join stadium as t2 on t1.stadium_id  =  t2.stadium_id where t1.year  =  2015