GATE CSE 2020 | Question: 14

Question

Which one of the following is used to represent the supporting many-one relationships of a weak entity set in an entity-relationship diagram?

• A. Diamonds with double/bold border 
• B. Rectangles with double/bold border
• C. Ovals with double/bold border
• D. Ovals that contain underlined identifiers

Comments

OK I now get it. They have asked about the representation of many-one "RELATIONSHIP"(so definitely it will be something with the diamonds). And since they mentioned "relationship" of a weak entity set, Ans will definitely be option A (Diamonds with double/bold border)

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yes, this was confusing at first read. it asks about the representation of the many-one relationship of a weak entity set. not representation of a weak entity set.

Answer 1

Answer : A 

Weak entity set is represented by Rectangles with double/bold border.

Comments

Option should be B, right ? Got it ! Please ignore

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__________correct answer is B , (A is just a typing mistake)____________

Answer 2

weak entity set represented by Rectangles with double/bold border.

weak entity relationships represented by Diamonds with double/bold border.

Comments

weak entity relationships is also called identifying relationships

Answer 3

Option A 

The entity sets which do not have sufficient attributes to form a primary key are known as weak entity sets and the entity sets which have a primary key are known as strong entity sets.

Weak entity represented by rectangle double/bold border

Identifying relationship represented with Diamond double /bold border 

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