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_72170 ( "Round" real, "Grand Prix" text, "Pole Position" text, "Fastest Lap" text, "Winning Driver" text, "Winning Constructor" text, "Report" text )

### Question ###
Which round had Michael Schumacher in the pole position, David Coulthard with the fastest lap, and McLaren - Mercedes as the winning constructor?

### Accurate SQL ###

SELECT COUNT("Round") FROM table_72170 WHERE "Pole Position" = 'Michael Schumacher' AND "Fastest Lap" = 'David Coulthard' AND "Winning Constructor" = 'McLaren - Mercedes'