What is North American Release Date, when Japanese Release Date is "2011-06-23"?
CREATE TABLE "games" (
  "series" text,
  "platform" text,
  "japanese_release_date" text,
  "north_american_release_date" text,
  "european_release_date" text,
  "australia_release_date" text
);
SELECT "north_american_release_date" FROM "games" WHERE "japanese_release_date"='2011-06-23';