What is the importance of a Primary Key in a table ? Explain with a suitable example.

The importance of a Primary Key in a table lies in its ability to uniquely identify tuples (or rows) within the table.

In this table, the "Salesman Number" column can be designated as the primary key. Each "Salesman Number" value uniquely identifies a salesperson in the table, and no two salespersons can have the same number. Additionally, the "Salesman Number" column would not accept null values, ensuring that every salesperson has a valid identifier.