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30 August, 16:58

Which of the following is a true statement? Question 33 options: Data entities correspond to sources/sinks on a data flow diagram. An entity type is described many times in the data model. A data entity will have many possible instances. Verbs are used to name entity types. Relationships correspond to data flows on a data flow diagram.

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  1. 30 August, 20:46
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    A data entity will have many possible instances.

    Explanation:

    A data model is the relative representation of data objects, showing the relationships between them as well as the rules guiding the relationships.

    The graphical representation of data model showing the data requirements of a database is Entity-Relationship Diagram (ERD).

    Components of ERD

    1. Entities: These refers to all the table that makes up a database. An specific example of an entity is called an Instance of an entity. E. g London, Moscow, Johannesburg, Lagos are all records in a table called location. This example shows that a data entity will have many possible instances.

    2. Attribute: This is the information needed to describe a particular table of database.

    3. Relationships: This shows how tables are linked together.
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