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Christian S. Jensen
Researcher at Aalborg University
Publications - 541
Citations - 26166
Christian S. Jensen is an academic researcher from Aalborg University. The author has contributed to research in topics: Temporal database & Query language. The author has an hindex of 80, co-authored 507 publications receiving 24234 citations. Previous affiliations of Christian S. Jensen include University of Maryland, College Park & Zhejiang University.
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Using differential techniques to efficiently support transaction time
TL;DR: An architecture for query processing in the relational model extended with transaction time is presented, which integrates standard query optimization and computation techniques with new differential computation techniques.
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Continuous Spatial Query Processing: A Survey of Safe Region Based Techniques
TL;DR: A comparative study of safe region-based approaches is provided, describing how safe regions are computed for different types of continuous spatial queries, and showing how they improve query efficiency.
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Queries on change in an extended relational model
Christian S. Jensen,Leo Mark +1 more
TL;DR: A data model that allows for the storage of detailed change history in so-called backlog relations and its extended relational algebra, in conjunction with the extended data structures, provides a powerful tool for the retrieval of patterns and exceptions in change history.
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Finding top-k relevant groups of spatial web objects
TL;DR: A new type of query functionality that returns top-k groups of objects while taking into account aspects such as group density, distance to the query, and relevance to thequery keywords is proposed.