Frequently Asked Questons on Attributes in DBMS
Why attributes are used?
Attributes are used to get more information about the entity which will help to store the data in a specific format. Attributes are essential parts of the entity as all entity-related data is stored in the form of attributes only.
Are columns called as attributes?
Yes, columns are nothing but the attributes and rows will be named as tuples. So for the student entity, the columns will have the attributes and each student entry will be called a tuple.
How many key attributes can an entity have?
An entity can have multiple key attributes but only one key item will be defined as a primary key attribute and the other key attribute will remain as a secondary key attribute.
Can an entity have zero attributes?
Yes, the entity can have zero attributes but that entity will not carry any information with us resulting in no use of the entity.
What are non-key attributes?
Attributes which does not identify as key attributes are known as non-key attributes. If any attributes do not have unique values across all tuples then it is identified as the non-key attributes.
Attributes in DBMS
Attributes are properties or characteristics of an entity. Attributes are used to describe the entity. The attribute is nothing but a piece of data that gives more information about the entity. Attributes are used to distinguish one entity from the other entity. Attributes help to categorize the entity and the entity can be easily retrieved and manipulate the entity. Attributes can help the database to be more structural and hierarchical. An entity with no attribute is of no use in the database.
Contact Us