user: Question: Which circuit has a length of 45 Minutes and is held on August 6?
Columns: ['Race', 'Length', 'Class', 'Circuit', 'Date']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['24 Hours of Daytona', '24 Hours', 'All', 'Daytona International Speedway', 'February 4 February 5']
SQL:

assistant: SELECT "Circuit" FROM "Table" WHERE "Length" = '45 Minutes' AND "Date" = 'August 6';