SQL Composite key with Example
Composite Key:
Key that consists of two or more attributes that uniquely identify any record in a table is called Composite key. But the attributes which together form the Composite key are not a key independentely or individually.
In the above picture we have a Score table which stores the marks scored by a student in a particular subject.
In this table student_id and subject_id together will form the primary key, hence it is a composite key.