Table: get_smart_episodes
Columns: season
network
episodes
premiered
ended
dvd_set_release_date

Question: When dis cbs release the DVD set?
SQL: SELECT "dvd_set_release_date" FROM get_smart_episodes WHERE "network" = 'cbs'

Question: What is the total season number for episodes later than episode 30?
SQL: SELECT SUM("season") FROM get_smart_episodes WHERE "episodes" > 30