Update and retrieval in a relational database through a universal schema interface
ACM Transactions on Database Systems (TODS)
Semantics for null extended nested relations
ACM Transactions on Database Systems (TODS)
Regular Article: The nested universal relation data model
Proceedings of the 30th IEEE symposium on Foundations of computer science
Data-driven understanding and refinement of schema mappings
SIGMOD '01 Proceedings of the 2001 ACM SIGMOD international conference on Management of data
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