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

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 ?

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Solution

In an Entity-Relationship Diagram (ERD), the supporting many-one relationships of a weak entity set are represented by a double diamond.

Here are the steps to understand this:

  1. In an ERD, entities are represented by rectangles, relationships are represented by diamonds, and attributes are represented by ovals.

  2. A weak entity is an entity that cannot be uniquely identified by its attributes alone; it must use a foreign key in conjunction with its attributes to create a primary key.

  3. The relationship between a weak entity and its supporting entity is represented by a double diamond, not a single diamond. This double diamond represents a many-one relationship, where many instances of the weak entity relate to one instance of the supporting entity.

  4. So, in the context of an ERD, a double diamond is used to represent the supporting many-one relationships of a weak entity set.

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In an Entity-Relationship Diagram “Diamonds” representsSelect one:a. Relationship setsb. Weak Entityc. Tabled. Attributes

Consider the following Entity-Relationship (E-R) diagram and three possible relationship sets (I, II and III) for this E-R diagram:I IIIIIIf different symbols stand for different values (e.g., t1 is definitely not equal to t2), then which of the above could not be the relationship set for the E-R diagram ?

What is the purpose of a weak entity in an ER diagram?a.To represent an entity with a unique keyb.To represent an entity that depends on another entity for identificationc.To represent an entity that does not have attributesd.To represent an entity with a strong identity

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