How many votes did Southern England cast whilst Northern Ireland cast 3?
CREATE TABLE "voting" (
  "song" text,
  "mobiles" real,
  "northern_ireland" real,
  "northern_england" real,
  "scotland" real,
  "southern_england" real,
  "wales" real,
  "total" real
);
SELECT "southern_england" FROM "voting" WHERE "northern_ireland"=3;