What is the turnout with 15 candidates and more than 377,591 valid poll?
CREATE TABLE "voting_details" (
  "constituency" text,
  "electorate" real,
  "turnout" text,
  "spoilt" text,
  "valid_poll" real,
  "quota" text,
  "seats" real,
  "candidates" real
);
SELECT "turnout" FROM "voting_details" WHERE "candidates"=15 AND "valid_poll">'377,591';