Trees and hierarchies can be found everywhere. In our computers’ filesystem, in online shops’ product hierarchies, in the organizational structure of a company, in blog categories, in family trees, the structure of an html page or in geography tables managing the relation between continents, countries cities.
![](https://rolandgeng.de/wp-content/uploads/2019/11/example_03.png)
In this article I will describe managing those type of data structure in MySQL using the Adjacency List Model.
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