yes or no for the sydney with yes for melbourne, no for perth, no for auckland and no for gold coast?
CREATE TABLE "1997" (
  "sydney" text,
  "melbourne" text,
  "perth" text,
  "adelaide" text,
  "gold_coast" text,
  "auckland" text
);
SELECT "sydney" FROM "1997" WHERE "melbourne"='yes' AND "perth"='no' AND "auckland"='no' AND "gold_coast"='no';