user: Question: Tell me the branding for frequency of 680 kHz
Columns: ['Calls', 'Frequency', 'Branding', 'Format', 'Timeslot', 'Group owner']
Types: ['text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['WGAN', '560 kHz', 'News Radio 560 WGAN', 'News/Talk', 'Live 3P-6P', 'Saga Communications']
SQL:

assistant: SELECT "Branding" FROM "Table" WHERE "Frequency" = '680 kHz';