How much Body Width/mm has a Body Length/mm of 18.4, and Pins of 40?
CREATE TABLE "type_i" (
  "part_number" text,
  "pins" text,
  "body_width_mm" real,
  "body_length_mm" real,
  "lead_pitch_mm" real
);
SELECT COUNT("body_width_mm") FROM "type_i" WHERE "body_length_mm"=18.4 AND "pins"='40';