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Building a tree in Apache Derby 10.10

I know this question has been asked probably a million times, so please forgive me asking it again. I am not a DBA and have very little knowledge of SQL and Derby, but need some kind of a solution as ...
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PostgreSQL: Store hierarchial data and return a recursive result with full path data

Background: I am considering whether to use LTREE or Recursive CTE with Materialized Path. For storing data, I am deciding between HSTORE or JSON. Objective: I need to store a hierarchial data. Each ...
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Proper tree NoSQL structure with focus on full-text searching

I developing an app with tree(folder-file) structure, on which I should perform full-text searches with MongoDB. I did a research on the best tree structure practices and found this great article, but ...
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How to represent group by in relational algebra

I have to plan a plan tree based on relational algebra.My question is that at some point I have a SORT ORDER BY the output of a join, so how do you represent group by in relational algebra.