What is the 2012 value with 479 in 2008?
CREATE TABLE "grand_slam_singles_performance_timeline" (
  "tournament" text,
  "2006" text,
  "2007" text,
  "2008" text,
  "2009" text,
  "2010" text,
  "2011" text,
  "2012" text
);
SELECT "2012" FROM "grand_slam_singles_performance_timeline" WHERE "2008"='479';