Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_25680 ( "Stage" real, "Winner" text, "General classification" text, "Mountains classification" text, "Points classification" text, "Youth classification" text, "Team Classification" text )

### Question ###
How many Mountains Classifications were in the race with Mike Northey as Youth Classification?

### Accurate SQL ###

SELECT COUNT("Mountains classification") FROM table_25680 WHERE "Youth classification" = 'Mike Northey'