Inheriting Values in SQL

Imagine a situation where you have hierarchical data with various values and you wanted to inherit values from ancestors if a given level in the hierarchy had null values. So if a level had a null value, it could inherit that missing value from the parent and if the parent didn’t have a value, the grandparent etc. etc. updwards until we reach the root. How would you do it?  Well in this article I’ll explore a few approaches.
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