user: Question: What date was the Piston's record at 23-47?
Columns: ['Game', 'Date', 'Team', 'Score', 'High points', 'High rebounds', 'High assists', 'Location Attendance', 'Record']
Types: ['real', 'text', 'text', 'text', 'text', 'text', 'text', 'text', 'text']
Sample row: [60.0, 'March 2', 'Boston', 'L 100–105 (OT)', 'Jonas Jerebko (16)', 'Ben Wallace (12)', 'Richard Hamilton (7)', 'The Palace of Auburn Hills 17,956', '21-39']
SQL:

assistant: SELECT "Date" FROM "Table" WHERE "Record" = '23-47';