user: Question: What is the leading scorer of the game with the Celtics as the visiting team?
Columns: ['Date', 'Visitor', 'Score', 'Home', 'Leading scorer', 'Attendance', 'Record']
Types: ['text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: ['2006-12-02', 'Bucks', '115–110', 'Warriors', 'Troy Murphy (23)', '18,086', '9–8']
SQL:

assistant: SELECT "Leading scorer" FROM "Table" WHERE "Visitor" = 'Celtics';