user: Question: How many winning constructor catagories are there when Mark Webber had the fastest lap? 
Columns: ['Rd.', 'Grand Prix', 'Pole position', 'Fastest lap', 'Winning driver', 'Winning constructor', 'Report']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [1.0, 'Australian Grand Prix', 'Lewis Hamilton', 'Jenson Button', 'Jenson Button', 'McLaren - Mercedes', 'Report']
SQL:

assistant: SELECT COUNT("Winning constructor") FROM "Table" WHERE "Fastest lap" = 'Mark Webber';