Question at position 7 In an Entity-Relationship Diagram (ERD), an entity is represented byA diamondA lineA rectangleAn oval单项选择题
A
A diamond
B
A line
C
A rectangle
D
An oval

Question

Question at position 7 In an Entity-Relationship Diagram (ERD), an entity is represented byA diamondA lineA rectangleAn oval

BlackTom AI · Accepted Answer

Let's parse the given question about standard ERD notation and identify what each symbol typically represents.
Option 1: 'A diamond' — In ER diagrams, diamonds are used to depict relationships between entities, not the entities themselves, so this choice mislabels the symbol.
Option 2: 'A line' — Lines (or connectors) illustrate the relationships and cardinalities between entities, but they do not represent an entity block; this option confuses the connection with the entity itself.
Option 3: 'A rectangle' — This is the correct convention: entities are drawn as rectangles, containing the entity name, while relationships are diamonds and attributes may be ovals. This choice accurately matches the standard ERD symbol for an entity.
Option 4: 'An oval' — Ovals (or circles) are used for attributes of an entity, not for representing the entity itself, so this option misidentifies the symbol for an entity.
In summary, the question tests your recognition of ERD glyph roles: rectangles denote entities, diamonds denote relationships, lines connect entities, and ovals denote attributes. Therefore, the only option that correctly names the symbol for an entity is the rectangle.

Question at position 7 In an Entity-Relationship Diagram (ERD), an entity is represented byA diamondA lineA rectangleAn oval单项选择题

类似问题

Question at position 15 The name used for an entity type should never be the same in other E-R diagrams on which the entity appears. TrueFalse

Question at position 8 The name used for an entity type should never be the same in other E-R diagrams on which the entity appears. TrueFalse

What does the ERD shown below depict?

The role of cardinality in an ERD is to define the specific attributes of each entity.

An attribute represented with a dashed oval line is a multivalued attribute.

Observe the ER diagram for the BZYX COMPANY: Which of the following is true according to the BZYX Company ER diagram?

According to this E/R diagram, which of the following is a derived attribute? Select one answer.

Which of the following is NOT true? Select one answer.

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