Treeset data structure stored in SQL tables

par cctan
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Once a stackoverflow user asked this: I have a table containing a column named parent which is able to store a parent ID. This makes it possible to create a tree-structure of my data. Are there any good helper-functions for travelling through such a tree-structure in MySQL? For example, if I have a row in my table and I want to be able to retreive all "parents" above it. So getting the it's parent's parent ID and so on...

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