For what year is the SAR no. 874?
CREATE TABLE "class_16_da_4_6_2_builders_works_numbers" (
  "sar_no" real,
  "builder" text,
  "year" real,
  "works_no" real,
  "firebox" text,
  "driver_diameter" text
);
SELECT "year" FROM "class_16_da_4_6_2_builders_works_numbers" WHERE "sar_no"=874;