WHAT IS THE LOWEST $50-1/2 OZ COIN WITH A 1997 YEAR AND $25-1/4 OZ LARGER THAN $27,100?
CREATE TABLE "non_proof_coins" (
  "year" real,
  "10_1_10_oz" text,
  "25_1_4_oz" real,
  "50_1_2_oz" real,
  "100_1_oz" text
);
SELECT MIN("50_1_2_oz") FROM "non_proof_coins" WHERE "year"=1997 AND "25_1_4_oz">'27,100';