Which Nationality has a Fate of sunk (mine), and a Tonnage (GRT) smaller than 2,266?
CREATE TABLE "ships_attacked" (
  "date" text,
  "u_boat" text,
  "name" text,
  "nationality" text,
  "tonnage_grt" real,
  "fate" text
);
SELECT "nationality" FROM "ships_attacked" WHERE "fate"='sunk (mine)' AND "tonnage_grt"<'2,266';