Match Each of the Following E-R Structures with Its Relational

question 168

Multiple Choice

Match each of the following E-R structures with its relational representation.
-Create a relation with primary key and nonkey attributes.

• A)regular entity
• B)weak entity
• C)binary or unary 1:1 relationship
• D)binary 1:N relationship
• E)binary or unary M:N relationship or associative entity
• F)binary or unary M:N relationship or associative entity with its own key

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Definitions:

Iritis

is inflammation of the iris, the colored part of the eye, which can cause pain, light sensitivity, decreased vision, and redness of the eye, and requires prompt treatment to prevent serious complications.

Astigmatism

A common vision condition that causes blurred vision due to an irregularly shaped cornea or lens within the eye.

Retinal Detachment

A serious condition where the retina, the light-sensitive layer of tissue at the back of the inner eye, becomes separated from its supporting layers, often leading to significant vision loss or blindness if not promptly treated.