CREATE TABLE "singles" (
  "year" real,
  "category" text,
  "champion" text,
  "runner_up" text,
  "score" text
);

Question: Which category had a year of 1991?
SQL: SELECT "category" FROM "singles" WHERE "year"=1991;

Question: What is the score having a runner-up of Magdalena Maleeva?
SQL: SELECT "score" FROM "singles" WHERE "runner_up"='magdalena maleeva';