Is it ok to make a table without a foreign key?

Question

Laravel

Hello. I'm trying to implement Many To Many Polymorphic Relations in an application . I came across the fact that, in theory, in a pivot table, one of the columns should have a foreign key to several tables. As far as I know, this is impossible. Actually a question from here, whether it is normal to do such relation without foreign keys?

Answer 1

I didn’t understand the question, in taggable_type we will have Post or Video, which will determine which entity the taggable_id belongs to