user: Question: what is the total number of opponent where date is November 23, 1980
Columns: ['Week', 'Date', 'Opponent', 'Result', 'Kickoff [a ]', 'Game site', 'TV', 'Attendance', 'Record']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['Week', 'Date', 'Opponent', 'Result', 'Kickoff [a ]', 'Game site', 'TV', 'Attendance', 'Record']
SQL:

assistant: SELECT COUNT("Opponent") FROM "Table" WHERE "Date" = 'November 23, 1980';