In the figure shown below, which attribute is a composite attribute in the Member table?

Question

BlackTom AI · Accepted Answer

To determine the composite attribute in the Member table, we need to identify attributes that are themselves composed of smaller sub-attributes.
Option 1: MemberID, MemberJoinDate. MemberID is a simple key attribute (primary key) and MemberJoinDate is a single date value; neither is shown as containing sub-parts, so they are not composite.
Option 2: YearsMember. This appears to be a single attribute representing a duration or count, not a composite structure made of multiple parts.
Option 3: FavoriteProducts. The notation {FavoriteProducts} with curly braces typically denotes a multivalued attribute, meaning a member can have multiple favorite products, but this is not the same as a composite attribute since it does not imply breaking into sub-attributes within one attribute; instead, it represents multiple values of one attribute.
Option 4: Address. In the diagram, Address is described as Address (Street, Suburb, Post Code, State), which explicitly lists multiple sub-components that together form the Address attribute. This is the classic depiction of a composite attribute, where one attribute is composed of several smaller attributes.

By evaluating each option, Address stands out as the composite attribute because it is explicitly broken into multiple sub-attributes (Street, Suburb, Post Code, State) within a single attribute structure.

In the figure shown below, which attribute is a composite attribute in the Member table?

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