What is Score, when Group Song is 就是你, and when Index is F2?
CREATE TABLE "episode_7_1_march_2008" (
  "index" text,
  "name" text,
  "song" text,
  "group_song" text,
  "score" text
);
SELECT "score" FROM "episode_7_1_march_2008" WHERE "group_song"='就是你' AND "index"='f2';