How to implement OData "calculate on fly" Tables?

Question

ASP.NET

I am developing a service using ASP.NET + MSSQL DB.
The essence of the problem:
I need to refer to specific tables using the OData standard and make a selection from them.
How, for example, to work with the Student table in the request http://localhost:[port]/api/values/student to get all the records of the table.
The examples on the web create controllers by explicitly specifying the table:
public IQueryable Get ()
{
return _ctx.Student.AsQueryable ();
}
But the problem is that I don't know what tables will be in the database. Their creation is meant even after writing the service.
How to implement so that the user writes a query to the table, and on my part it has already been checked whether it exists at all and then work has already been done with it?