The relational algebra is a procedural query language for relational databases. In this paper
we survey extensions of the relational algebra that can query databases recording time …

A temporal database contains time-varying data. In a real-time database transactions have
deadlines or timing constraints. In this paper we review the substantial research in these two …

While a learner is doing a task to practice what he has learnt, he usually needs some help
and instructions. In this research, a computer supported collaboration learning in ubiquitous …

This chapter introduces a new approach to temporal extensions of SQL. In contrast with most
of the current proposals we use single time points as references to time, while still achieving …

A wide range of database applications manage time-varying data. Many temporal query
languages have been proposed, each one the result of many carefully made yet subtly …

This paper incorporates a temporal dimension to nested relations. It combines research in
temporal databases and nested relations for managing the temporal data in nontraditional …

Adding time to the relational model has been a daunting task [Bolour et al. 1982, McKenzie
1986, Soo 1991, Starn & Snodgrass 1988]. More than two dozen time-extended relational …

Social media has become a common platform for global communication across the world
due to its rapid dissemination of information among a large audience. Its popularity has …

Migrating applications from conventional to temporal database management technology has
received scant mention in the research literature. This paper formally defines three …

During forensic database investigations, audit records become a crucial evidential element;
particularly, when certain events can be attributed to insider activity. However, traditional …