Linking tables, Laravel models, to select non-repeating elements?

Question

Laravel

Good day. I read it, but I don’t quite understand how to make such a scheme correctly.
There are 2 tables. (ID, NAME)
The attributes are the same. It is necessary to select only those elements that are not in the second table.
It can be done through the DB class, but it would be more correct through Eloquent, and I don’t quite understand how to link it.
Is it appropriate to use $this->belongsTo. I read about the relations themselves, but did not understand how to select non-repeating fields.

Answer 1

It through join the request becomes. Type in mysql join in Yandex and go to the pictures section, there are a lot of diagrams showing how to write such a query.