What's the most melamine content that has more than 1 samples failed and produced by Guangzhou Jinding Dairy Products Factory?
CREATE TABLE "tests_conducted_by_aqsiq" (
  "producer" text,
  "product" text,
  "samples_taken" real,
  "samples_failed" real,
  "melamine_content_mg_kg" real
);
SELECT MAX("melamine_content_mg_kg") FROM "tests_conducted_by_aqsiq" WHERE "producer"='guangzhou jinding dairy products factory' AND "samples_failed">1;