What is the 2011/ 12 when the 2010/ 11 is not held, and the 2012/ 13 is A?
CREATE TABLE "performance_and_rankings_timeline" (
  "2004_05" text,
  "2007_08" text,
  "2010_11" text,
  "2011_12" text,
  "2012_13" text
);
SELECT "2011_12" FROM "performance_and_rankings_timeline" WHERE "2010_11"='not held' AND "2012_13"='a';