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What are you doing with the DB? There's no reasonable way to make a blanket recommendation w/o knowing what your needs or goals are.

So use PG.

It will be a full system for an online store for weapons. So I have to choose a DB, back-end which will be Java and front-end which I have no idea yet. Angular,React...

I don't see how it even matters from a technical standpoint.

PostgreSQL for quality Oracle for Curriculum

What language will you be writing in? Not all languages can access all databases.

Java.

Advice on Relational Database