user: Question: When dis CBS release the DVD set?
Columns: ['Season', 'Network', 'Episodes', 'Premiered', 'Ended', 'DVD set release date']
Types: ['real', 'text', 'real', 'text', 'text', 'text']
Sample row: [1.0, 'NBC', 30.0, '18-Sep-1965', '07-May-1966', '05-Aug-2008']
SQL:

assistant: SELECT "DVD set release date" FROM "Table" WHERE "Network" = 'CBS';