Explanation
In the relational model of databases, a primary key is a specific choice of a minimal set of attributes that uniquely specify a tuple in a relation. Informally, a primary key is "which attributes identify a record" , and in simple cases are simply a single attribute: a unique id. A field is also known as a column that stores the same type of data and hence can be called a category of data. *************** vu FIA CBT PAPER 15-12-2021
