What are composite Key attributes?
Composite key attributes are combinations of two or more attributes that uniquely identify a record in a table together. Unlike simple key attributes which use a single key to identify a record. a composite key uses multiple attributes. These are useful in cases where no single attribute can uniquely identify a record.
Example: The different examples of composite key attributes are
- Student address will contain house number, street name, and pin code in it.
- Student name will contain first_name, middle_name, and last_name in it.
- Employee contact information can contain his email id, mobile number and other contact information it.
In this figure Composite attribute is address and name and its component attributes are state, street, zip and first name, middle name, last name respectively.
Composite Attribute in DBMS
In DBMS (Database Management System), keys are fundamental to maintaining the integrity and efficiency of the data. Among various types of keys, composite keys play an important role mainly when a single attribute is not sufficient to answer or identify a record. In this article, we will discuss in detail about Composite key attributes in DBMS.