good day everyone, I'm new to Xcode and I would like to start the first steps with a DB. I have two problems: 1) I have no idea which free practice DB you can use. 2) consequently I am not yet familiar with any use of the DB. I would be useful for an indication of a free DB that can be used with Xcode and possibly an example of code to be able to write and read it. I thank anyone who wants to help me

Problems using Core data. I have version 14.3.12 of Xcode installed. Unfortunately, after creating a "Libro" entity and using the NSMMenagedObject Subclass creation function, I have an error code in the files created by it. That is, two new files are created respectively with the name “Libro+CoreDataClass” and “Libro+CoreDataProperties”. The following code is created in the first file: import Foundation import CoreData @objc(Libro) public class Libro: NSManagedObject { } the following error message appears on the same line as the "Libro" class definition: invalid redeclaration of 'Libro' the compilation fails and is not executed. Does anyone have a solution?

I installed the XCODE 14.3.1 version. but I no longer have the possibility to simulate hipad ver 3 on which I developed some apps. I ask. Is it possible to install multiple versions of Xcode? or alternatively does anyone know a way to simulate hipad ver 3 on Xcode 14.3.1? Thank you