CREATE TABLE "doubles" (
  "outcome" text,
  "tournament" text,
  "surface" text,
  "partner" text,
  "opponents" text,
  "score" text
);

Question: What surface was the città di caltanissetta played on?
SQL: SELECT "surface" FROM "doubles" WHERE "tournament"='città di caltanissetta';

Question: What was the score in Volkswagen Challenger tournament?
SQL: SELECT "score" FROM "doubles" WHERE "tournament"='volkswagen challenger';