What are combination key?

Combination keys are a type of key used in databases and data structures to uniquely identify a record or an entry based on the values of two or more columns. Unlike a single primary key, which relies on one column, a combination key ensures uniqueness by combining multiple attributes, thus allowing for more complex data relationships. They are particularly useful in scenariOS where no single attribute can uniquely identify a record. In relational databases, combination keys are often implemented as composite primary keys.