What is pk?

PK stands for "primary key" in database management. It refers to a unique identifier for each record in a table, which is used to identify and retrieve information quickly. The primary key can be a single attribute or a combination of multiple attributes that uniquely identify a record. PKs are essential for maintaining data integrity and making sure that each record is unique within a database. They can also be used to enforce referential integrity and establish relationships between tables. In most cases, primary keys are automatically generated by the database system, but they can also be defined manually.