Techniques are disclosed for storing and rendering a graphical user interface (GUI) that includes a display area for specifying result fields and operators to define an abstract query. Each result field corresponds to a logical field specification of a data abstraction model abstractly describing data in a database. The GUI further includes a display area for specifying classification fields for the abstract query, each classification field including a result field and a classification definition, and the display area including a result field window displaying available result fields and graphical elements configured to allow specification of classification definitions for one or more selected result fields. The classification definition is suitable for dividing data into a plurality of categories. The GUI further includes a selection element for specifying whether the specified classification fields are included with the abstract query for execution, and another selection element for initiating execution of the abstract query.