When you place a chart in a dashboard panel, you use the Query Editor to retrieve data from a database for display on your chart or data table. If applicable, you can add conditions or constraints that filter the data so that the chart or data table displays the information you want dashboard consumers to see.
Using parameters is critical if you plan on using dashboard prompts or linking content in
one dashboard panel to content on another dashboard panel. For example, suppose you create a
pie chart and you want to filter details associated with an exploded pie slice in the
adjoining data table as shown in the example below. In this instance, you must use a
parameter that allows the data table to update when a dashboard consumer clicks on a pie
slice. Optionally, you can parameterize the query condition so that the content is updated
based on a user interaction, such as changing a prompt value. 