Databases Test 1

Result

Databases Test 1

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Question 1
1 / -0

Relations produced from E - R Model will always be in ______

A
1 NF

B
2 NF

C
3 NF

D
4 NF

Solution

Concept:
ER model describes data as entities, relationships and attributes. It is a high-level conceptual data model. This model is used to define the data elements and relationships for a specified system.
Entity:
Entity is a thing in the real world with an independent existence. An entity may be an object with a physical existence. For example: particular person, car or it may be an object with a conceptual existence For example: company, job etc.
Attributes:
Each entity has attributes – the particular properties that describe it.
Relationship:
It is used to describe the relation between two entities.
Explanation:
E-R Diagram is design level task and Relational model is implementation.
Relational model is implemented from E-R Diagram and in this it gets rid of multivalued attribute.
Relations produced from E - R Model will always be in 1NF, that is, Simple atomic values with non-multivalued attributes.
NOTES:
Relation is also referred as table.