Types of Attribute
Types of Attributes in DBMS
In a Database Management System (DBMS), attributes are the properties or characteristics of an entity. They define the type of data that can be stored in each column of a table. Here are the key types of attributes commonly found in DBMS:
1. Simple Attribute:
Cannot be divided into smaller components.
Example: Age, Gender, or ID number.
2. Composite Attribute:
Can be divided into smaller sub-parts, which represent more basic attributes with independent meanings.
Example: Full Name can be split into First Name and Last Name; Address can be divided into Street, City, State, and Zip Code.
3. Single-Valued Attribute:
Holds a single value for a particular entity.
Example: Social Security Number (SSN), Birth Date.
4. Multi-Valued Attribute:
Can hold multiple values for a particular entity.
Example: Phone Numbers, Email Addresses.
5. Derived Attribute:
Values are derived from other attributes.
Example: Age can be derived from Birth Date; Total Salary can be derived from Base Salary and Bonuses.
6. Stored Attribute:
The actual value is stored in the database.
Example: Birth Date (as opposed to Age which is derived).
7. Null Attribute:
Can have a NULL value, indicating the absence of a value.
Example: Middle Name might be NULL if not provided.
8. Key Attribute:
Used to uniquely identify entities in an entity set.
Example: Employee ID, which is unique for each employee.
9. Complex Attribute:
Combines composite and multi-valued attributes.
Example: An Address attribute containing multiple Address components and potentially multiple values for each (e.g., multiple addresses).
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Types of Attributes in DBMS
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