Temporal Query Languages
Historical query language
A temporal query language is a database query language that offers some form of built-in support for the querying and modification of time-referenced data, as well as enabling the specification of assertions and constraints on such data. A temporal query language is usually quite closely associated with a temporal data model that defines the underlying data structures that the language applies to.
When the relational data model was proposed by Codd, he also proposed two query languages: relational calculus and relational algebra. Similarly, temporal data models are closely coupled with temporal query languages.
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