Category "erd"

ERD - Recursive relationship with two primary keys

I have a product table: Product (ID, Version) And I am having trouble creating a recursive table named "Update". this table should have a product ID and for eac

Confused on the difference between One, and One and Only One in ERDs

Sorry for the links I'm new! I'm confused on the difference between one and one and only one and where they would be used. I just started the class so I apologi