user: Question: What is the total attendance at games against the new york mets with a record of 18-18?
Columns: ['Date', 'Opponent', 'Score', 'Loss', 'Attendance', 'Record']
Types: ['text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['May 1', 'Houston Astros', '4-2', 'Wheeler (0-1)', 12258.0, '15-11']
SQL:

assistant: SELECT SUM("Attendance") FROM "Table" WHERE "Opponent" = 'new york mets' AND "Record" = '18-18';