user: Question: What joined that was founded prior to year 1856 and whose current conference is the Big South (NCAA Division I)?
Columns: ['Institution', 'Location', 'Founded', 'Type', 'Enrollment', 'Nickname', 'Joined', 'Left', 'Current Conference']
Types: ['text', 'text', 'real', 'text', 'real', 'text', 'text', 'text', 'text']
Sample row: ['Anderson University', 'Anderson, South Carolina', 1911.0, 'Private', 2907.0, 'Trojans', '1998', '2010', 'SAC']
SQL:

assistant: SELECT "Joined" FROM "Table" WHERE "Founded" < 1856.0 AND "Current Conference" = 'Big South (NCAA Division I)';