Attributes in DBMS
Attributes
In this article, we will learn about Multivalued Attributes in DBMS. Attributes define what type of data is stored in a database table . Some times we need to store one or more values of a single attribute for that purpose multivalued attributes are used.
ATTRIBUTES IN DBMS
Attributesdefine what type of data is stored in a database table- For example student table stores the details of Student name, roll no, marks, attendance, etc all these details corresponding to the properties or attributes of the student table
- There are 6 types of attributes
Simple attributesComposite attributesSingle valued attributesMulti valued attributesDerived attributesKey attributes
Simple Attributes
Simple attributes are those attributes which can not be divided further.
Example :
All the attributes are simple attributes as they can not be divided further.
Composite Attributes
Composite attributes are those attributes which are composed of many other simple attributes.
Example :
The attributes “Name” and “Address” are composite attributes as they are composed of many other simple attributes.
Single Valued Attributes
Single valued attributes are those attributes which can take only one value for a given entity from an entity set.
Example :
All the attributes are single valued attributes as they can take only one specific value for each entity.
Multi Valued Attributes
Multi valued attributes are those attributes which can take more than one value for a given entity from an entity set.
Example :
The attributes “Mob_no” and “Email_id” are multi valued attributes as they can take more than one values for a given entity.
Derived Attributes
Derived attributes are those attributes which can be derived from other attribute(s).
Example :
The attribute “Age” is a derived attribute as it can be derived from the attribute “DOB”.
Key Attribute
Key attributes are those attributes which can identify an entity uniquely in an entity set.
Example :
The attribute “Roll_no” is a key attribute as it can identify any student uniquely.
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