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_1991 ( "Stage (Winner)" text, "General Classification" text, "Points Classification" text, "Mountains Classification" text, "Young Rider Classification" text, "Team Classification" text )

### Question ###
Name the number of stage winners for team columbia

### Accurate SQL ###

SELECT COUNT("Stage (Winner)") FROM table_1991 WHERE "Team Classification" = 'Team Columbia'