Abstract
Time constraints and the temporal dimension are an essential aspect in many real world systems, like cooperative work and industrial production systems. Traditional database systems support these features only through application programs. The recent tendency consists of representing the temporal aspects in the database schema and in the corresponding query language and supporting them directly in the DBMS. In this paper the different aspects of adding the temporal dimension in an object-oriented data model are analyzed and a classification scheme is proposed for the types of possible queries. Based on this classification, a query language for the object-oriented TF-ORM data model is presented and discussed in detail. In TF-ORM. both transaction and valid times are associated to data, and the query language is used to retrieve information about the database current valid information, about past valid values, and about past histories.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
