A method for hierarchy processing in relational systems
Information Systems
Joe Celko's SQL for Smarties: Trees and Hierarchies
Joe Celko's SQL for Smarties: Trees and Hierarchies
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Proceedings of the 2008 ACM SIGMOD international conference on Management of data
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A relational nested interval encoding scheme for XML data
DEXA'06 Proceedings of the 17th international conference on Database and Expert Systems Applications
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Nested Intervals generalize Nested Sets. They are immune to hierarchy reorganization problem. They allow answering ancestor path hierarchical queries algorithmically - without accessing the stored hierarchy relation.