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The '''nested set model''' is a particular technique for representing [[nested set]]s (also known as [[tree (data structure)|tree]]s or [[hierarchy|hierarchies]]) in [[relational database]]s.
The term was apparently introduced by [[Joe Celko]]; others describe the same technique using different terms.<ref>[http://
<ref>[http://articles.sitepoint.com/article/hierarchical-data-database/2 Storing Hierarchical Data in a Database: ''Modified Pre-order Tree Traversal''], by Gijs van Tulder, at articles.sitepoint.com</ref>
== Motivation ==
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