question: Which round had Michael Schumacher in the pole position, David Coulthard with the fastest lap, and McLaren - Mercedes as the winning constructor?
answer: SELECT COUNT(round) FROM table_1132600_3 WHERE pole_position = "Michael Schumacher" AND fastest_lap = "David Coulthard" AND winning_constructor = "McLaren - Mercedes"
context: CREATE TABLE table_1132600_3 (round VARCHAR, winning_constructor VARCHAR, pole_position VARCHAR, fastest_lap VARCHAR)