Who is the producer of 金必氏牌嬰幼兒配方乳粉 ?
CREATE TABLE "tests_conducted_by_aqsiq" (
  "producer" text,
  "product" text,
  "samples_taken" real,
  "samples_failed" real,
  "melamine_content_mg_kg" text
);
SELECT "producer" FROM "tests_conducted_by_aqsiq" WHERE "product"='金必氏牌嬰幼兒配方乳粉';