How many transactions were paid in EUR in the morning of 2012/8/26?
'2012/8/26' can be represented by '2012-08-26'; The morning refers to the time before '13:00:00'
SELECT COUNT(T1.TransactionID) FROM transactions_1k AS T1 INNER JOIN customers AS T2 ON T1.CustomerID = T2.CustomerID WHERE T1.Date = '2012-08-26' AND T1.Time < '13:00:00' AND T2.Currency = 'EUR'