Question: Which young classification has general classification of Christian Vande Velde for Team Columbia and Mark Cavendish?
SQL: SELECT "Young Classification" FROM "2-15502952-15" WHERE "General Classification" = 'Christian Vande Velde' AND "Team Classification" = 'Team Columbia' AND "Sprint Classification" = 'Mark Cavendish';

Question: What mountains classification corresponds to Mark Cavendish and the Garmin-Chipotle-H30?
SQL: SELECT "Mountains Classification" FROM "2-15502952-15" WHERE "General Classification" = 'Mark Cavendish' AND "Team Classification" = 'Garmin-Chipotle-H30';

Question: Who was the winner for a Sprint Classification and Young Classification to Mark Cavendish and Garmin-Chipotle-H30 for team?
SQL: SELECT "Stage (Winner)" FROM "2-15502952-15" WHERE "Sprint Classification" = 'Mark Cavendish' AND "Team Classification" = 'Garmin-Chipotle-H30' AND "Young Classification" = 'Mark Cavendish';