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.

MySql: "Foreign key constraint is incorrectly formed" #551. Copy link. Description. EdvaldoLima. opened on May 27, 2020. Issue body actions. Greetings dear colleagues. I'm facing this problem with ...

If you don't have an existing MySQL database, you can use the provided setup script to create a sample schema for demonstration purposes. This script will set up a MySQL database in Docker for quick ...

Hence, the birth of the MySQL InnoDB vs. MyISAM debate. Of course, MySQL users prior to the 5.5 release were probably perplexed by the assertion that the database didn't support foreign keys. MySQL ...

Indexes in MySQL are used to speed up access in the database and help enforce database constraints (such as UNIQUE and FOREIGN KEY). ... MySQL optimization key #7: Embrace observability.