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Contribution Details
| Type | Book Chapter |
| Scope | Discipline-based scholarship |
| Title | Temporal Coalescing |
| Organization Unit | |
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| Editors |
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| Item Subtype | Original Work |
| Refereed | Yes |
| Status | Published in final form |
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| Booktitle | Encyclopedia of Database Systems, Second Edition |
| ISBN | 978-1-4614-8266-6 |
| Place of Publication | New York, NY, USA |
| Publisher | Springer |
| Page Range | 58 |
| Date | 2018 |
| Abstract Text | Temporal coalescing is a unary operator applicable to temporal databases that is similar to duplicate elimination in conventional databases. Temporal coalescing merges value-equivalent tuples, i.e., tuples with overlapping or adjacent timestamps and matching explicit attribute values. Tuples in a temporal relation that agree on the explicit attribute values and that have adjacent or overlapping timestamps are candidates for temporal coalescing. The result of operators may change if a relation is coalesced before applying the operator. For instance, an operator that counts the number of tuples in a relation or an operator that selects all tuples with a timestamp spanning at least 3 months are sensitive to temporal coalescing. |
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