CREATE TABLE "butterfly_collection" (
  "year" real,
  "butterfly" text,
  "artist" text,
  "mintage" real,
  "issue_price" text,
  "finish" text
);

Question: Which artist's work is the butterfly Tiger Swallowtail?
SQL: SELECT "artist" FROM "butterfly_collection" WHERE "butterfly"='tiger swallowtail';

Question: Which artist uses a finish of selective gold plating?
SQL: SELECT "artist" FROM "butterfly_collection" WHERE "finish"='selective gold plating';

Question: What mintage earlier than the year 2006 has the butterfly great spangled fritillary.
SQL: SELECT "mintage" FROM "butterfly_collection" WHERE "year"<2006 AND "butterfly"='great spangled fritillary';