CREATE TABLE table_23247 ("Rank" FLOAT, "Couple" TEXT, "Judges" FLOAT, "Public" FLOAT, "Total" FLOAT, "Vote percentage" TEXT, "Result" TEXT)

When roxanne and daniel are the couple what is the highest rank?
SELECT MAX("Rank") FROM table_23247 WHERE "Couple" = 'Roxanne and Daniel'
SELECT MAX("Rank") FROM "table_23247" WHERE "Couple" = 'Roxanne and Daniel'