user: Question: What is the Community Band with a 4BCB Callsign?
Columns: ['Callsign', 'Area served', 'Band', 'Freq currently', 'Purpose']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['4AT', 'Atherton', 'AM', '4AT (National)', 'Commercial']
SQL:

assistant: SELECT "Band" FROM "Table" WHERE "Purpose" = 'Community' AND "Callsign" = '4BCB';