Question: Find the names of the clubs that have at least a member from the city with city code "HOU".
SQL: SELECT DISTINCT t1.clubname FROM club AS t1 JOIN member_of_club AS t2 ON t1.clubid  =  t2.clubid JOIN student AS t3 ON t2.stuid  =  t3.stuid WHERE t3.city_code  =  "HOU"