Abstract
In the last two decades, the relational data model has gained popularity because of its simplicity and solid mathematical foundation. However, the relational data model does not address the temporal dimension of data. Variation of data over time is treated in the same way as ordinary data. In fact, most applications require temporal data to certain extent. Hence, the concept of temporal database is coined. In the design of relational or temporal data bases, normal forms play central role. Several normal forms for temporal relational databases have been proposed previously. But the order of application of these temporal normal forms and the relations among them is not explicit. The role played by temporal normal forms during temporal data base design, closely parallels that of normal forms during conventional data base design. In this paper, it is shown that how temporal normal forms, including the related concepts of temporal dependencies and temporal keys may be used so that temporal database can be designed in an efficient manner.
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