Data model and method for establishing a database system

A data model and a method for establishing a database system are provided. The data model includes: an identification data having an identification code corresponding to a single entity; an attribute data having a characteristic state for the single entity; and a temporal data having a time record of the characteristic state, wherein the identification code is a unified reference for all the data. The method includes steps of: (a) providing a single entity with an identification code and recording the single entity and its identification code in an identification data; (b) according to the identification code regarded as a reference, recording a characteristic state for the single entity in an attribute data and recording a date-time for the characteristic state in a temporal data.