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Sams Teach Yourself Crystal Reports 9 in 24 Hours phần 4

Các chuyên gia mục được sử dụng để xem hoặc sửa đổi các thuộc tính của các phần báo cáo. Để truy cập chuyên gia mục, thực hiện một trong các hành động sau đây:Nhấp chuột phải trên nhãn của phần (hoặc tên, nằm trên thanh bên trái), bạn muốn làm việc với, và sau đó chọn mục chuyên gia từ menu pop-up. | Another option important to understand is relating to the set of groups that are excluded by the group selection. By default these groups are all combined under a new group called Others. You might or might not want to include this others group in your report. If you choose not to uncheck the option labeled Include Others. Clicking OK returns focus to the report that now should only display the top three shipment methods based on the total order amount. Like the record selection the group selection also has a formula that can be defined to use a custom expression to determine which groups to include in the report. The group selection formula can be found on the Report menu under Selection Formulas Group. Some other options available in the group sort expert include Bottom N which is the opposite of Top N and Top and Bottom Percentage which allow a filtering of the top X percent of groups. Running Totals The last kind of summary to be discussed in this hour is a running total. In some older versions of Crystal Reports to create a running total a report developer had to create a collection of formula fields so a feature was added just to handle running totals. To illustrate this follow the next few steps 1. Create a new report using the Orders table. Add the Order ID Order Date and Order Amount fields to the details section of the report. You can reformat the order date to a more user-friendly format if you prefer by right-clicking the field and selecting Format. 2. Finally add a sort based on the Order Data field. This report now shows all orders in the order they were placed. This is a perfect scenario for a running total that would show an cumulative total of orders so that the viewer of the report could see what the current order amount was at any given time. 3. To add a running total right-click the Order Amount field and select Insert Running Total from the Context menu. The Create Running Total Field dialog is displayed as shown in Figure 1.1. Figure 7.7. .