CREATE TABLE "doubles_30_12_18" (
  "outcome" text,
  "date" text,
  "tournament" text,
  "partner" text,
  "opponents_in_the_final" text
);

Question: What date shows corrado barazzutti's partner?
SQL: SELECT "date" FROM "doubles_30_12_18" WHERE "partner"='corrado barazzutti';

Question: Which date has the tom gullikson butch walts final, and who was the runner-up?
SQL: SELECT "date" FROM "doubles_30_12_18" WHERE "outcome"='runner-up' AND "opponents_in_the_final"='tom gullikson butch walts';