CREATE TABLE table_204_494 (id NUMBER, "episode #" CLOB, "original air date  ( uk ) " CLOB, "episode title" CLOB, "guest cast" CLOB, "dvd # 1" NUMBER)

what is the least number of guest casts on an episode ?
SELECT MIN("guest cast") FROM table_204_494
SELECT MIN("guest cast") FROM "table_204_494"