Foreign keys can refer to another column in the same table. The top-level folder might need to be its own parent - I don't know if it'll let you have a NULL there.

I am having a problem when I try to push value into a foreign key in MySQL table I don't know if it's correct but I have used the GET method to pass the primary key through a link but it didn't work ...

By using an ER model, you can identify the primary keys and the foreign keys of each table, and how they relate to each other. Add your perspective Help others by sharing more (125 characters min ...

The foreign key in the database table where it resides is actually the primary key of the other table. Here’s an example to make this clearer: If we have a database table labeled, say, “orders,” and ...

Database + version: MySql 8.0.23 OS: Ubuntu 20.04. Select applicable template from below. @smorey2. Feature discussion / request. Explain what is your use case: I have two databases (sso, and items).

TypeORM fails to set the foreign key value on insert when the related entity's primary key is also part of a foreign key. I have a three level model hierarchy which models user, person and party.