Table: vuelta_2010
Columns: stage
winner
general_classification
points_classification
mountains_classification
combination_classification
team_classification

Question: How many winners were there when the mountains classification was not awarded? 
SQL: SELECT COUNT("winner") FROM vuelta_2010 WHERE "mountains_classification" = 'not awarded'

Question: Who was awarded mountains classifications when Mikel Nieve was the winner? 
SQL: SELECT "mountains_classification" FROM vuelta_2010 WHERE "winner" = 'Mikel Nieve'

Question: Who was awarded mountains classification when Alessandro petacchi won? 
SQL: SELECT "mountains_classification" FROM vuelta_2010 WHERE "winner" = 'Alessandro Petacchi'