user: Question: Name the total number of opponets venue for Oklahoma
Columns: ['Missouri vs.', 'Overall Record', 'at Columbia', 'at Opponents Venue', 'at Neutral Site', 'Last 5 Meetings', 'Last 10 Meetings', 'Current Streak', 'During Time in Big 12']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Baylor', 'MU, 16-10', 'MU, 10-2', 'BU, 6-4', 'Tied, 2-2', 'MU, 4-1', 'MU, 7-3', 'W 4', 'MU, 13-6']
SQL:

assistant: SELECT COUNT("at Opponents Venue") FROM "Table" WHERE "Missouri vs." = 'Oklahoma';