CREATE TABLE "stage_results" (
  "date" text,
  "course" text,
  "distance" text,
  "type" text,
  "winner" text
);

Question: Name the date which has type of plain stage
SQL: SELECT "date" FROM "stage_results" WHERE "type"='plain stage';

Question: Name the distance for Course of vittorio veneto to marina romea
SQL: SELECT "distance" FROM "stage_results" WHERE "course"='vittorio veneto to marina romea';