CREATE TABLE "singles" (
  "tournament" text,
  "2007" text,
  "2008" text,
  "2009" text,
  "2010" text,
  "2011" text,
  "2012" text
);

Question: What is the 2011 entry for the row with a 2007 entry of 558?
SQL: SELECT "2011" FROM "singles" WHERE "2007"='558';

Question: What is the 2010 entry for the row that has a 2009 entry of 270?
SQL: SELECT "2010" FROM "singles" WHERE "2009"='270';

Question: What is the 2009 entry for the row that has a 2007 entry of A and a tournament entry of US Open?
SQL: SELECT "2009" FROM "singles" WHERE "2007"='a' AND "tournament"='us open';

Question: What is the 2008 entry for the row that as a 2011 entry of 1R?
SQL: SELECT "2008" FROM "singles" WHERE "2011"='1r';