Learn how to create, modify, and manage foreign keys in your database, and what benefits and challenges they bring for data relationships, integrity, and performance.

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.

Create a set of "buffer" tables that are linked to each other with foreign keys. Import a large amount of data into the buffer tables Rename the buffer tables to take over the "primary" tables, ...

A foreign key is a column or group of columns in a table that links to a column or group of columns in another table. The foreign key places constraints on data in the related tables, which allows ...