CREATE TABLE "classification_leadership_by_stage" (
  "stage" text,
  "winner" text,
  "general_classification" text,
  "points_classification" text,
  "mountains_classification" text,
  "young_rider_classification" text,
  "trofeo_fast_team" text
);

Question: Name the Trofeo Fast team for roberto visentini
SQL: SELECT "trofeo_fast_team" FROM "classification_leadership_by_stage" WHERE "winner"='roberto visentini';

Question: Name the young rider classification for giuseppe saronni at stage 6
SQL: SELECT "young_rider_classification" FROM "classification_leadership_by_stage" WHERE "general_classification"='giuseppe saronni' AND "stage"='6';

Question: What is the young rider classification for jesper worre and stage 3
SQL: SELECT "young_rider_classification" FROM "classification_leadership_by_stage" WHERE "mountains_classification"='jesper worre' AND "stage"='3';