Question

The relational database is the primary method for organizing and maintaining data today in information systems. It organizes data in two-dimensional tables with rows and columns called relations. In a database, __________ is used to uniquely identify each record for retrieval or manipulation.

Answer 1

A key field is used to uniquely identify each record for retrieval or manipulation.

Step-by-step explanation:

In a database there are many, having similar entities. So in order to differentiate each entity from other we need to set a key field among all the field which is always unique for each entity.

For example:

In a database of a company having data about its employees, the key field might be their ID. As some employees can have same names, addresses, phone numbers but cannot have the same ID.