user: Question: what is the correct year for # / county of 09 Cass?
Columns: ['School', 'Location', 'Mascot', '# / County', 'IHSAA Class', 'Year Joined', 'Previous Conference']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Caston', 'Fulton', 'Comets', '25 Fulton', 'A', 1978.0, 'Three Rivers']
SQL:

assistant: SELECT "Year Joined" FROM "Table" WHERE "# / County" = '09 Cass';