WHAT IS THE LOWEST ELECTORATE WITH 31,511 VOTES, AND PERCENT YES SMALLER THAN 57.2?
CREATE TABLE "plebiscite" (
  "constituency" text,
  "electorate" real,
  "votes" real,
  "turnout" real,
  "spoilt" real,
  "percent_yes" real
);
SELECT MIN("electorate") FROM "plebiscite" WHERE "votes"='31,511' AND "percent_yes"<57.2;