The most important characteristic of an entity is its primary key, used to uniquely identify each entity instance.
A column, or group of columns, known as a primary key in a table uniquely identifies each row of data. For instance, CustomerNo, which displays the ID numbers assigned to individual customers.
The primary key of a relational database, often called the primary keyword, is a key that is unique to each entry. It is a unique identification number, much like the ones on a driver's license, phone with an area code, or car (VIN). A relational database's primary key must always be distinct.
Thus, it is a primary key.
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