What is Non-Resident Head of Mission, when Local Location is "Warsaw", and when Mission is "Poland"?
CREATE TABLE "non_resident_heads_of_missions" (
  "mission" text,
  "resident_country" text,
  "local_location" text,
  "local_mission" text,
  "non_resident_head_of_mission" text,
  "local_position" text
);
SELECT "non_resident_head_of_mission" FROM "non_resident_heads_of_missions" WHERE "local_location"='warsaw' AND "mission"='poland';