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_478 ( "Stage" real, "Winner" text, "General classification" text, "Points classification" text, "Mountains classification" text, "Intergiro classification" text, "Trofeo Fast Team" text )

### Question ###
what is total number of points where the stage is 17?

### Accurate SQL ###

SELECT COUNT("Points classification") FROM table_478 WHERE "Stage" = '17'