CREATE TABLE table_23575917_8 (episode VARCHAR, davids_team VARCHAR)

How many shows did team David consist of vernon kay and dara briain
SELECT COUNT(episode) FROM table_23575917_8 WHERE davids_team = "Vernon Kay and Dara Ó Briain"
SELECT COUNT("episode") FROM "table_23575917_8" WHERE "Vernon Kay and Dara Ó Briain" = "davids_team"