With the Analytic Views extension to SQL Developer, you can easily organize data using a dimensional model, add aggregations and calculations to data sets, and present data in analytic views that can be queried with relatively simple SQL.
For information on attribute dimensions, hierarchies, analytic views, measures, and calculated measures, see Overview of Analytic Views in Oracle Database Data Warehousing Guide.
You can view and run SQL scripts and tutorials that create analytic view component objects, including many calculated measures, and examples of queries of the hierarchies and analytic views from the Oracle Live SQL website at Oracle Live SQL.