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Information Presentation Basics

The Pivot Grid has been designed to convert lengthy table data into compact reports that display summarized data, and can easily be customized by end-users to achieve the desired layout. These compact reports bring you the functionality of Pivot Tables that are available in such applications as Microsoft Access or Microsoft Excel. At the same time, they bring you visual consistency with the rest of our advanced controls and eliminate the need to have anything but totally managed controls in your applications.

Expanded What Kind of Data is Used as the Source for the PivotGrid Control

To see how the PivotGrid converts raw table data into a flexible report, imagine a car sales database with the following structure:

The main data we are interested in is contained in the Orders table. Each record in this table is a single-car purchase.

Data tables, like the Orders table in our example, are often referred to as Fact Tables. This is because such tables contain the facts that took place, and will be analyzed. The remaining tables are simply needed to obtain human-readable information. In our example, they are needed to get the car model name or car category using the car id stored within the fact table. They wouldn't be needed if a user could identify cars by their IDs. These additional tables are usually called Dimension Tables.

To get human-readable information about car sales, we can merge data from all the tables into a single query. And this is how this data would look if displayed by the Data Grid or another grid control:

The number of records in such a query will match the number of records in the fact table. In our example, the number of records will match the number of car orders, and thus, the number of cars sold (since each record in the Orders table is a single-car purchase). If we need to analyze car sales over a long period, say several years, we can get numerous records which are almost impossible to analyze using traditional grid controls.

If you wish to see how sales have changed over time, you will most probably be interested in changes that took place from month to month or even from year to year. Another data analysis alternative is to see which car model has the most sales. In either case, you would like to compare summaries calculated against groups of related records. You can obtain such values even when using traditional grid controls, but with the PivotGrid less effort is needed, and the resulting reports are much more compact and easier to analyze.

Expanded PivotGrid Compared to Traditional Grid Controls

As with other data-aware controls, the PivotGrid control requires you to create a number of fields - objects bound to real data source fields. The fields whose data you need to analyze (sales amount in our sample) should be placed in the data area. Then place some fields in the row and column area. For instance, if you wish to know how many models of a particular type were sold on a certain date, you can place the Model and OrderDate fields in those areas.

By default, all the unique field values of column and row fields are listed along the control's top and left edges. These values represent column and row headers - the axes of the report. Where each column and row intersect, the PivotGridControl calculates and displays a summary against a data field for a subset of records. All records from this subset have matching values in a column field(s) and row field(s) and these values are identified by the column and row headers.

The image below shows you how raw table data is transformed into a compact report that allows data to be easily analyzed.

Expanded PivotGrid Compared to a 3D Chart

The pivot report can also be compared to a three-dimensional chart in a general case. If you analyze car sales data, you will have car models on one axis, time on another axis and sales volume on the third. In terms of the XtraPivotGrid, you could have the car model field in the column area, purchase date field in the row area and the sales amount calculated for each column and row intersection.

For example, take a look at the following 3D chart that shows the changes in sales over years for different car categories.

The XtraPivotGrid can display the same data in the following format.

Note

Each column and row intersection in the PivotGrid can contain more than one cell. For instance, in the example above you can show the number of cars sold in addition to the sales volume. To achieve such multi-summary layouts, simply place several fields in the data area. For more information about this feature, please refer to the Data Cell Layout document.

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