Database: debit_card_specializing
Question: What was the product id of the transaction happened at 2012/8/23 21:20:00?
SQL: SELECT T1.ProductID FROM transactions_1k AS T1 INNER JOIN gasstations AS T2 ON T1.GasStationID = T2.GasStationID WHERE T1.Date = '2012-08-23' AND T1.Time = '21:20:00'