Another important property is Show Calculations. In the Key Browser, set the Show Calculations property to 'true' and expand Datasources. You'll see the 'count' key was added under Datasources. A 'count' is the total number of rows in your Datasource. Expand your columns and you'll see that a number of built-in keys were added. For each column you can calculate the following: value, total of all the values in that column, average, maximum value, minimum value, running total, and running average. These keys are available for each column that you bring into your table once you set Show Calculations to 'true'. The Show Calculations property can come in pretty handy once you're familiar with how it works.
Show Calculations is not recommended for text strings, but is great for showing numerical calculations.
By dragging any one of the calculation keys from the Key Browser on to a report, you will see the result of that calculation in the Preview Panel using the dataset below.