= Nested set model in SQL
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= Nested set index
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How to implement <Nested set model> in <SQL>:
* https://stackoverflow.com/questions/192220/what-is-the-most-efficient-elegant-way-to-parse-a-flat-table-into-a-tree/42781302\#42781302 contains the correct left/size representation and update queries, which makes it much easier to maintain the tree without having to worry about the sizes of siblings which are constant
* https://stackoverflow.com/questions/192220/what-is-the-most-efficient-elegant-way-to-parse-a-flat-table-into-a-tree/194031\#194031 amazing ASCII art representations of the structure. Unfortunatly uses a wonky left/right representation, rather than the much more natural left/size representation from the other post