The temporal query language TQuel
ACM Transactions on Database Systems (TODS)
Extending relational algebra to manipulate temporal data
Information Systems
A recursive algebra for nested relations
Information Systems
Temporal Relational Data Model
IEEE Transactions on Knowledge and Data Engineering
The Historical Relational Data Model (HRDM) and Algebra Based on Lifespans
Proceedings of the Third International Conference on Data Engineering
A complete temporal relational algebra
The VLDB Journal — The International Journal on Very Large Data Bases
The time relational model
Join operations in temporal databases
The VLDB Journal — The International Journal on Very Large Data Bases
Capturing Temporal Constraints in Temporal ER Models
ER '08 Proceedings of the 27th International Conference on Conceptual Modeling
Nested bitemporal relational algebra
ISCIS'06 Proceedings of the 21st international conference on Computer and Information Sciences
Modeling temporal dimensions of semistructured data
Journal of Intelligent Information Systems
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The natural join operation for bitemporal attribute timestamping nested relations of arbitrary depth is formally defined. The advantages of nesting, recursion, and attribute timestamping are combined. Different cases of the operation are distinguished, relevant to the number, the type and the nesting levels of the common attributes involved. An algorithm is presented for the generalised case. The natural join operation is proved to be a consistent extension of the natural join operation of the conventional relational model. The notion of the temporal nested key is redefined.