Which Hanyu Pinyin has a GDP in 2011 larger than 688.02 billion yuan and a regional population of 8,700,400 in 2010?
CREATE TABLE "cities" (
  "city" text,
  "hanzi" text,
  "hanyu_pinyin" text,
  "regional_population_2010" text,
  "gdp_2011_billion_yuan" real
);
SELECT "hanyu_pinyin" FROM "cities" WHERE "gdp_2011_billion_yuan">688.02 AND "regional_population_2010"='8,700,400';