user: Question: Which Attendance is the highest one that has a Record of 15-28?
Columns: ['Date', 'Opponent', 'Score', 'Loss', 'Attendance', 'Record']
Types: ['text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['May 1', '@ New York Mets', '1-2', 'Majewski (1-2)', 28310.0, '8-18']
SQL:

assistant: SELECT MAX("Attendance") FROM "Table" WHERE "Record" = '15-28';