Tally the customer ID of orders that were shipped to Brazil by Margaret Peacock from 3/31/97 to 12/10/97.
"Brazil" is the ShipCountry; from 3/31/97 to 12/10/97 refers to 1997-03-31 < ShippedDate < 1997-10-12
SELECT DISTINCT T2.CustomerID FROM Employees AS T1 INNER JOIN Orders AS T2 ON T1.EmployeeID = T2.EmployeeID WHERE T1.LastName = 'Peacock' AND T1.FirstName = 'Margaret' AND T2.ShipCountry = 'Brazil' AND T2.ShippedDate BETWEEN '1997-03-31 00:00:00' AND '1997-12-10 23:59:59'