user: Question: What's the number of the episode seen by 2.99 millions of people in the US, where performer 2 was Heather Anne Campbell?
Columns: ['No.', '#', 'Original airdate', 'Performer 1', 'Performer 2', 'Performer 3', 'Performer 4', 'U.S. viewers (millions)']
Types: ['real', 'real', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [220.0, 1.0, 'July16,2013', 'Wayne Brady', 'Gary Anthony Williams', 'Colin Mochrie', 'Ryan Stiles', '2.92']
SQL:

assistant: SELECT "#" FROM "Table" WHERE "Performer 2" = 'Heather Anne Campbell' AND "U.S. viewers (millions)" = '2.99';