user: Question: Which ISHAA school joined in 2012 and has a mascot of the Panthers?
Columns: ['School', 'Location', 'Mascot', 'Enrollment 12-13', 'IHSAA Class', 'IHSAA Class Football', 'County', 'Year Joined', 'Previous Conference']
Types: ['text', 'text', 'text', 'real', 'text', 'text', 'text', 'real', 'text']
Sample row: ['Beech Grove', 'Beech Grove', 'Hornets', 819.0, 'AAA', 'AAA', '49 Marion', 2005.0, 'Mid-State']
SQL:

assistant: SELECT "IHSAA Class" FROM "Table" WHERE "Year Joined" < 2012.0 AND "Mascot" = 'Panthers';