Can you tell me the lowest Losses that has the Gains smaller than 0?
CREATE TABLE "gains_holds_and_losses_by_party" (
  "party" text,
  "seats_dissol" real,
  "seats_2012" real,
  "gains" real,
  "holds" real,
  "losses" real,
  "net_change" text
);
SELECT MIN("losses") FROM "gains_holds_and_losses_by_party" WHERE "gains"<0;