as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
system
explain what primary key is in a relational database.
user
a primary key is a field in a relational database table that uniquely identifies each record. for example, if a table contains employee information, the employee's id number would be the primary key. this ensures that each record can be uniquely identified.
assistant