Dynamic functional dependencies and database aging
Journal of the ACM (JACM)
Principles of database and knowledge-base systems, Vol. I
Principles of database and knowledge-base systems, Vol. I
Elements of relational database theory
Handbook of theoretical computer science (vol. B)
Temporal FDs on complex objects
ACM Transactions on Database Systems (TODS)
Time Granularities in Databases, Data Mining and Temporal Reasoning
Time Granularities in Databases, Data Mining and Temporal Reasoning
An Algebraic Representation of Calendars
Annals of Mathematics and Artificial Intelligence
Extending Existing Dependency Theory to Temporal Databases
IEEE Transactions on Knowledge and Data Engineering
Design of Temporal Relational Databases Based on Dynamic and Temporal Functional Dependencies
Proceedings of the International Workshop on Temporal Databases: Recent Advances in Temporal Databases
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Temporal functional dependencies (TFDs) add a temporal component to classical functional dependencies to deal with temporal data. As an example, while functional dependencies model constraints like "employees with the same role get the same salary", TFDs can represent constraints like "for any given month, employees with the same role get the same salary (but their salary may change from one month to the next one)" or "current salaries of employees uniquely depend on their current and previous roles". In this paper, we propose a general framework for specifying TFDs, possibly involving different time granularities, and for checking whether or not a given database instance satisfies them. The proposed framework subsumes existing formalisms for TFDs and it allows one to encode TFDs which are not captured by them.