In Chen’s ERD, what is a ternary relationship? A. One relationship connecting to one entity B. One relationship connecting to two entities C. One relationship connecting to three entities D. None correct Answer: Option C
In Chen’s ERD, what is a binary relationship? A. One relationship connecting to one entity B. One relationship connecting to two entities C. One relationship connecting to three entities D. None correct Answer: Option B
In Chen’s ERD, what is a unary relationship? A. One relationship connecting to one entity B. One relationship connecting to two entities C. One relationship connecting to three entities D. None correct Answer: Option A
In Chen’s ERD, what “double-line diamond-shape” symbol represents? A. Entity B. Identified Relationship C. Relationship D. None correct Answer: Option B
In Chen’s ERD, what “diamond-shape” symbol represents? A. Relationship B. Attribute C. Entity D. None correct Answer: Option A
In Chen’s ERD, what “dotted ellipse” symbol represents? A. Atomic attribute B. Multi-valued attribute C. Derived attribute D. All correct Answer: Option C
In Chen’s ERD, what “double-line ellipse” symbol represents? A. Atomic attribute B. Multi-valued attribute C. Derived attribute D. None correct Answer: Option B
Why a composite attribute should be decomposed into atomic attributes? A. Easy for doing sort, search and format B. Easy to backup C. Easy to restore D. None correct Answer: Option A
Why Chen’s ERD is important for design a database? A. It shows clear meaning of a relationship B. It is recommended by school C. It is easy to draw D. None correct Answer: Option A
What is is the first step of design a database? A. Draw ERD B. Normalize the database C. Start coding D. All correct Answer: Option A
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