CREATE TABLE table_203_397 (id DECIMAL, "series" TEXT, "launch date" TEXT, "finale date" TEXT, "days" DECIMAL, "housemates" DECIMAL, "winner" TEXT, "main presenter" TEXT, "grand prize" TEXT, "liveshow\ audience\ millions" DECIMAL)

who was the main presenter previous to barbara d'urso ?
SELECT "main presenter" FROM table_203_397 WHERE "launch date" < (SELECT "launch date" FROM table_203_397 WHERE "main presenter" = "barbara d'urso") ORDER BY "launch date" DESC LIMIT 1
SELECT "main presenter" FROM "table_203_397" WHERE "launch date" < (SELECT "launch date" FROM "table_203_397" WHERE "barbara d'urso" = "main presenter") ORDER BY "launch date" DESC NULLS LAST LIMIT 1