A key competitor, which is a field or fields as the primary key, unique features, and are not used as a primary key, such as a primary key. Best product name is unique, but not as a primary key is a key competitor.
Key competitors, as one field or multiple fields qualify. A primary key is unique and not used as a primary key ID as the primary key. The name is not unique, but is not the primary key is a key competitors.
Key competitors, which is one field or multiple fields are qualified. A primary key unique and not used as the primary key, such as the code is the primary key. The product name is unique as well, but is not the primary key is a key competitors.