CREATE TABLE table_23575917_6 (episode VARCHAR2, davids_team VARCHAR2)

When bill oddie and frank skinner are both on the davids team what is the episode?
SELECT episode FROM table_23575917_6 WHERE davids_team = "Bill Oddie and Frank Skinner"
SELECT "episode" FROM "table_23575917_6" WHERE "Bill Oddie and Frank Skinner" = "davids_team"