Database: debit_card_specializing
Question: For the customers who paid in the euro, what is their average total price of the transactions?
SQL: SELECT AVG(T1.Price) FROM transactions_1k AS T1 INNER JOIN gasstations AS T2 ON T1.GasStationID = T2.GasStationID INNER JOIN customers AS T3 ON T1.CustomerID = T3.CustomerID WHERE T3.Currency = 'EUR'