A method for aggregating data in database tables. A computer receives a request to create an aggregation object comprising a set of related tables and aggregation rules. The computer system creates an aggregation object comprising multiple tables with related key and data columns and managed as a single entity with a single definition. Upon receiving data in the form of a new, inserted, or updated row, the computer system automatically aggregates the data to all objects in the aggregation object hierarchy by creating a summarized row for the current table using the inserted, merged or updated row and defined aggregation rules for each object.