Hierarchical data in SQL
Last modified: October 10, 2019
Contribute to Data School
We are actively working on this chapter. We are looking for two types of contributions:
- Help writing this chapter
- Share your story about working through this problem at work
Please reach out to @Matt David on our slack to discuss what you want to contribute.
Data School wants a comprehensive post with visuals to help people understand storing hierarchical data. Please use stack overflow to understand the various methods: https://stackoverflow.com/questions/4048151/what-are-the-options-for-storing-hierarchical-data-in-a-relational-database
The structure of the post should be
- Answer the question simply (provide sql query when appropriate)
- Define example scenario we will be using (use a familiar dataset: facebook friends, Amazon store, Uber riders, etc)
- Provide a small table
- Use images to show what is happening
- link to other Data School pages/images where appropriate (joins, aggregations, subqueries, window functions, case when)
- Demonstrate in detail with SQL
- Recap why this was important to answer the question
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