System, Method, and Data Structure for Automatically Generating Database Queries Which Are Data Model Independent and Cardinality Independent

Systems and methods are provided for performing a query in a distributed system. In one example, a query generation system receives an identification of data item components and associations between the data item components, wherein the data item components include a measure and a category, and wherein the identified association indicates that the measure is independent of another data item component, indicates that the measure is dependent on another data item component, or indicates that two or more data item components are correlated. The query generation system creates and executes a database query for retrieving data item components, wherein the database query includes a first Uquery, wherein the first Uquery includes a Mx segment subquery and a U0 segment subquery, wherein the Mx segment subquery is associated with a table that contains the measure, a table that contains columns for a calculated measure, or a correlated table, and wherein the U0 segment subquery is associated with a table that contains the category, a table that contains columns for a calculated category, a dependent measure table, or a dependent filter table. In another example, the query generation system generates a virtual results table by aggregating the Uquery results from one Uquery with Uquery results from another Uquery and reports the virtual results table.