user: Question: How many different items appear in he attendance column at Sun Devil Stadium?
Columns: ['Bowl Game', 'Date', 'Stadium', 'City', 'Television', 'Matchup/Results', 'Attendance', 'Payout (US$)']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['AdvoCare V100 Independence Bowl', 'December 28, 2009', 'Independence Stadium', 'Shreveport, Louisiana', 'ESPN2', 'Georgia 44, Texas A&M 20', 49653.0, '$1,100,000']
SQL:

assistant: SELECT COUNT("Attendance") FROM "Table" WHERE "Stadium" = 'Sun Devil Stadium';