Question: How many winners were there when the mountains classification was not awarded? 
SQL: SELECT COUNT("Winner") FROM "1-25551880-2" WHERE "Mountains classification" = 'not awarded';

Question: Who was awarded mountains classifications when Mikel Nieve was the winner? 
SQL: SELECT "Mountains classification" FROM "1-25551880-2" WHERE "Winner" = 'Mikel Nieve';

Question: Who was awarded mountains classification when Alessandro Petacchi won? 
SQL: SELECT "Mountains classification" FROM "1-25551880-2" WHERE "Winner" = 'Alessandro Petacchi';