user: Question: How many rounds was the fight when the record was 4-0?
Columns: ['Res.', 'Record', 'Opponent', 'Method', 'Event', 'Round', 'Time', 'Location']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text', 'text']
Sample row: ['Loss', '6-4', 'Mike Kyle', 'TKO (punches and elbows)', 'KOTC: Legacy', 2.0, '4:53', 'Nevada , United States']
SQL:

assistant: SELECT "Round" FROM "Table" WHERE "Record" = '4-0';