CREATE TABLE "by_constituency" (
  "constituency" text,
  "electorate" real,
  "s_spoilt_vote" real,
  "total_poll_pct" text,
  "for_pct" text,
  "against_pct" text
);

Question: which electorate is 54787 of the constituency
SQL: SELECT "constituency" FROM "by_constituency" WHERE "electorate"=54787;

Question: in electorate of 83850 what is the minimum s split vote
SQL: SELECT MIN("s_spoilt_vote") FROM "by_constituency" WHERE "electorate"=83850;