multi-level database, like Firebase real time database?

[Ben van Jaarsveld]

Hi fellow programmers...

I am new to databases, I code with Java, Flutter and am learning Php to use with my backend:
My QUESTION: most databases have only one level of information, Is there any databases that I can use in my Backend that is multi-level, like the Firebase Realtime Database? something that looks like a Json file???

Thanks

[Tim Moores]

I don't think it's correct to say "most databases have only one level of information". Relational DBs have tables, which can mirror information as structured and nested as you can think of. Think of ORM libraries that can map structured object hierarchies to tables.

Relational DBs may not be best suited to the structure you need, though. Maybe a document DB like MongoDB would be better suited. And since you mention JSON, that's just text, so if that is actually what you want to store, a text data type in a relational DB would work fine.

But it all depends on the kind of data you need to store, and how you would need to access it.