A comparison of historical relational query languages
The Second Biennial European Joint Conference on Engineering Systems Design and Analysis,1994
275 - 282
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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.
Relational database systems
Historical database (HDB)
Relational query languages