CREATE TABLE "classification_leadership" (
  "stage" real,
  "winner" text,
  "general_classification" text,
  "points_classification" text,
  "mountains_classification" text,
  "young_rider_classification" text
);

Question: When Alberto Contador Kanstantsin Sivtsov was the general classification and Alessandro Petacchi was the points classification at the same time while Mark Cavendish is the winner, who was the mountain classification?
SQL: SELECT "mountains_classification" FROM "classification_leadership" WHERE "general_classification"='Alberto Contador Kanstantsin Sivtsov' AND "points_classification"='Alessandro Petacchi' AND "winner"='Mark Cavendish';

Question: Who was the young rider classification when Alessandro Petacchi won?
SQL: SELECT "young_rider_classification" FROM "classification_leadership" WHERE "winner"='Alessandro Petacchi';

Question: Who was the young rider classification when Diego Ulissi won? 
SQL: SELECT COUNT("young_rider_classification") FROM "classification_leadership" WHERE "winner"='Diego Ulissi';

Question: What is the name of the young rider classification when Paolo Tiralongo won?
SQL: SELECT "young_rider_classification" FROM "classification_leadership" WHERE "winner"='Paolo Tiralongo';