How to make this request in ORM?

Question

Laravel

How to make this request in ORM?

SELECT `id` FROM `table` WHERE `field1` >= `field2`;

Answer 1

Table::whereRaw('field1 >= field2')->get()

Answer 2

Through the model:
Through the table

DB::table('table')->where('field1','>=',field2)->lists('id')->get();

Answer 3

In documentation see "whereColumn" https://laravel.com/docs/5.7/queries#where-clauses