What is Fastest Lap, when Date is Leeds, Alabama, and when Circuit is April 19?
CREATE TABLE "calendar_and_results" (
  "circuit" text,
  "location" text,
  "date" text,
  "pole_position" text,
  "fastest_lap" text,
  "winner" text
);
SELECT "fastest_lap" FROM "calendar_and_results" WHERE "date"='leeds, alabama' AND "circuit"='april 19';