When ground is manuka oval what is the home team score?
CREATE TABLE "group_2" (
  "home_team" text,
  "home_team_score" text,
  "away_team" text,
  "away_team_score" text,
  "ground" text,
  "date" text,
  "crowd" real
);
SELECT COUNT("home_team_score") FROM "group_2" WHERE "ground"='Manuka Oval';