Question

what do you understand by primary key field​

Answer 1

Explanation:

A primary key is a field in a table which uniquely identifies each row/record in a database table. Primary keys must contain unique values. A primary key column cannot have NULL values.

A table can have only one primary key, which may consist of single or multiple fields

Answer 2

Answer:

an attribute/field that uniquely identifies each record in a table is called primary key field.

some of the features of primary key are:

•a table can have only one primary key

•a primary key cannot be left empty

•every value entered in primary key field must be unique

•it can be used to relate different tables in a database