This paper summarizes the major concepts, approaches, and implementation strategies that
have been generated over the last fifteen years of research into data base management …

To add time support to the relational model, both first normal form (1NF) and non-1NF data
models have been proposed. Each has associated advantages and disadvantages. For …

Normal forms play a central role in the design of relational databases. Several normal forms
for temporal relational databases have been proposed. These definitions are particular to …

Temporal data. bases has been an active a. rea of research for the last fifteen years, with a
corpus nearing 700 papers [Kline93]. Most d&abase conferences include at least one paper …

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 …

Time is one of the most difficult aspects to handle in real world applications such as
database systems. Relational database management systems proposed by Codd offer very …

Normal forms play a central role in the design of relational databases. Recently several
normal forms for temporal relational databases have been proposed. The result is a number …

Time is one of the most difficult aspects to handle in real world applications, especially in
database systems. Relational database management systems proposed by Codd offer very …

Now-relative temporal data play an important role in most temporal applications, and their
management has been proved to impact in a crucial way the efficiency of temporal …

Four major problems that complicate read and write accesses to instances in object-oriented
databases are discussed. The four problems are: difficulty in providing ad hoc commutativity …