Looking at the entity-relationship diagram for a regulatory agency database
they have attribute identifiers of PK, FKn, and U1. The first is the Primary
Key and the second is a Foreign Key, but I've not before seen a 'Un'
identifyier. I've no idea what DBMS they're using (but suspect Oracle). My
web search used in-effective terms so I could not find the answer there.
What does U1 represent?
Rich