user: Question: How many people attended Match No. 31?
Columns: ['Match No.', 'Home Team', 'Score', 'Away Team', 'Attendance']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['21', 'Nippon Steel Oita F.C.', '3-1', 'Matsumoto Yamaga F.C.', '261']
SQL:

assistant: SELECT "Attendance" FROM "Table" WHERE "Match No." = '31';