Discuss the difference between a composite key and a composite attribute.How would each be indicated in an ERD?

Subject: DatabaseIdentify ALL errors and correction on the entity relationship diagram (ERD) given in Figure 5.i. Circle the errors identified on the diagram.ii. For each error identified, correct them. Show your corrections either by redrawing the corrected diagram OR by describing how the errors should be corrected next to the circles that you have identified.

In order to be used as a primary key, which of these characteristics must an attribute possess with respect to a single instance of the entity?  There must be a maximum of one attribute instance. There must be many instances of the attribute. There must be at most one entity instance that each attribute instance describes. There must be at least one instance of the attribute. There must be zero or more instances of the attribute.

Provide an example of a Key Attribute.