Database management system

摘要

A database system configures a storage model in accordance with a hierarchical tree-like structure to enable fast and comprehensive data extraction functions. A plurality of entities, attributes and entity occurrences are each assigned a unique, multi-character expression. The expression has a predetermined hierarchical structure which defines the relationship between each entity, attribute and entity occurrence with every other entity, attribute and entity occurrence. The expressions are stored in an expression set table linking each element of each expression with a natural language phrase or data definition. Events are recorded in an entity history table each event having an associated expression. Data is extracted from the database according to a multi-character query expression comprising characters that are deterministic to the query and characters that are non-deterministic to the query. Data extracted from the database is also filtered according to a plurality of multi-character profile expressions each comprising characters that are deterministic and characters that are non-deterministic and which together define filtration criteria.