44+ Design Er Diagram Foreign Key Notation Example Download Zip Gif. Er diagrams were originally used only to represent the er model. Each car can only be financed by one bank, therefore the primary key bankid from the bank table is used as the foreign key.
Designing an er diagram consider the following set of requirements for a university database.
Not to mention if i want one column to be in a fk relation and also to be part of a table index. Define each of the following database terms relation primary key foreign key can also be applied in the inverse. A weak entity is an entity that must defined by a foreign key relationship with another entity as it cannot be uniquely identified by its own attributes alone. Er diagrams were originally used only to represent the er model.