Abstract
There are key issues in temporal relational data modelling such as representation of temporal data, temporal grouping identifiers, primary keys of temporal relations and temporal integrity constraints. Temporal grouping is a fundamental aspect of temporal data modelling and is the basis for the specification and enforcement of temporal integrity constraints. We extend and generalize traditional integrity constraints for the temporal domain by formally defining the temporal grouping identifier and show how it can replace a temporal primary key like a temporal atom, a temporal integrity constraint has a data and a temporal component. We also introduce the notion of consistent evolution of a temporal database that lays the foundation for an efficient implementation of temporal integrity constraints. We also provide clauses that need to be added to SQL for specifying the temporal integrity constraints.
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