How many samples were taken of 嬰幼兒配方乳粉2段基粉 ?
CREATE TABLE "tests_conducted_by_aqsiq" (
  "producer" text,
  "product" text,
  "samples_taken" real,
  "samples_failed" real,
  "melamine_content_mg_kg" text
);
SELECT COUNT("samples_taken") FROM "tests_conducted_by_aqsiq" WHERE "product"='嬰幼兒配方乳粉2段基粉';