CREATE TABLE table_25912 ("Episode" TEXT, "First broadcast" TEXT, "Seans team" TEXT, "Daves team" TEXT, "Scores" TEXT)

In how many episodes was Dave's team made up of David Walliams and Louis Walsh?
SELECT COUNT("Episode") FROM table_25912 WHERE "Daves team" = 'David Walliams and Louis Walsh'
SELECT COUNT("Episode") FROM "table_25912" WHERE "Daves team" = 'David Walliams and Louis Walsh'