I have a college assignment to create an entity-relationship diagram (ERD) for a database we're going to build. That's fine, but I have to include something called an "Operational Master" in the ERD. The lecturer's description is vague at best, and I can't seem to find any info about it online.
Basically speaking, we have to create an ERD for a game rental service with at least one "operational master". The only other reference to it in the lecture notes was to "add an index for the 'operational master'". It was never really explained during the lecture as far as I can recall. I get what an index is, but not what is meant by the "operational master".
Has anyone any ideas on what this might be?