Tell me the 2008 for 2012 of 4r and 2009 of a
CREATE TABLE "singles_performance_timeline" (
  "tournament" text,
  "2008" text,
  "2009" text,
  "2010" text,
  "2011" text,
  "2012" text
);
SELECT "2008" FROM "singles_performance_timeline" WHERE "2012"='4r' AND "2009"='a';