Converting a One-To-Many Unary Relationship into a Relational Database from an E-R

question 7

Multiple Choice

Converting a one-to-many unary relationship into a relational database from an E-R diagram ____.

• A) can be done by adding another copy of the unique identifier of the single entity's table into the same table with a different attribute name
• B) can be done by splitting the attributes of the single entity into two tables, each with its own copy of the unique identifier
• C) requires the creation of an additional table beyond the one that represents the single entity in the relationship
• D) a & b above
• E) a & c above

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Definitions:

Pulmonary Semilunar

A valve between the right ventricle of the heart and the pulmonary artery that prevents blood from flowing back into the heart chamber after it has been pumped out.

Aortic Semilunar

A valve in the heart located at the base of the aorta, which prevents backflow of blood into the left ventricle after it has been ejected into the aorta during systole.

Left Sternal Border

The left sternal border refers to the area along the left side of the sternum (breastbone), where certain heart sounds can be auscultated most clearly.

Supply Chain

The network of manufacturers, suppliers, and logistics providers involved in producing, handling, and distributing goods or services from raw materials to end consumers.