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SQL Pattern to get "root/ start" of uneven hierarchy dataset
I feel this is a common problem and I've seen it in some SQL challenges even but for the life of me, cannot think clearly about a solution.
Say you have an uneven hierarchy. Elements that belong to ...
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Joining recursive table in PostgreSQL
Situation
I have two simple tables, one called "node_relations" and one called "node_information". The table "node_relations" represents a simple parent-child hierarchy, having only two columns "id" ...
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