Comparison of historical relational query languages
Tin Erkan, Tansel Abdullah Uz
American Society of Mechanical Engineers, Petroleum Division (Publication) PD
ASME, New York, NY, United States
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Please cite this item using this persistent URLhttp://hdl.handle.net/11693/27790
We introduce a historical relational data model in which N1NF relations are used and 1-level of nesting is allowed. Attributes can either be atomic or temporal atom. An atomic attribute represents a time invariant attribute. A temporal atom consists of two components, a value and a temporal set, which is a set of times denoting the validity period of the value. We define a relational tuple calculus for this model. We follow a comparative approach towards completeness of historical query languages.
- Conference Paper 2294