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 "1-28538368-2" 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 "1-28538368-2" WHERE "Winner" = 'Alessandro Petacchi';

Question: Who was the young rider classification when Diego Ulissi won? 
SQL: SELECT COUNT("Young rider classification") FROM "1-28538368-2" WHERE "Winner" = 'Diego Ulissi';

Question: What is the name of the young rider classification when Paolo Tiralongo won?
SQL: SELECT "Young rider classification" FROM "1-28538368-2" WHERE "Winner" = 'Paolo Tiralongo';