Table schema:
CREATE TABLE table_name_26 (young_classification VARCHAR, sprint_classification VARCHAR, general_classification VARCHAR, team_classification VARCHAR)

Question: Which young classification has general classification of Christian Vande Velde for Team Columbia and Mark Cavendish?
SQL: SELECT young_classification FROM table_name_26 WHERE general_classification = "christian vande velde" AND team_classification = "team columbia" AND sprint_classification = "mark cavendish"