Find the number of students who is older than 20 in each dorm.
SELECT count(*) ,  T3.dorm_name FROM student AS T1 JOIN lives_in AS T2 ON T1.stuid  =  T2.stuid JOIN dorm AS T3 ON T3.dormid  =  T2.dormid WHERE T1.age  >  20 GROUP BY T3.dorm_name
SELECT count(*) ,  T3.dorm_name FROM student AS T1 JOIN lives_in AS T2 ON T1.stuid  =  T2.stuid JOIN dorm AS T3 ON T3.dormid  =  T2.dormid WHERE T1.age  >  20 GROUP BY T3.dorm_name
[{'count(*)': 1, 'dorm_name': 'Anonymous Donor Hall'}, {'count(*)': 2, 'dorm_name': 'Dorm-plex 2000'}, {'count(*)': 2, 'dorm_name': 'Fawlty Towers'}, {'count(*)': 2, 'dorm_name': 'Smith Hall'}]