What is a primary key state it's use in a table
Answers
Answer
A primary key is a special relational database table column (or combination of columns) designated to uniquely identify all table records.
A primary key’s main features are:
It must contain a unique value for each row of data.
It cannot contain null values.
A primary key is either an existing table column or a column that is specifically generated by the database according to a defined sequence
One or more columns that are configured as the table’s single identifier field is termed as a primary key.
Explanation:
This key is a special relational database table column that is designed to exclusively determine the whole table records. The primary key has a unique value of every single row of data.
However, this key will not have null values. Moreover, it is either an existing table column or a column which, exactly made by the database as per a defined sequence. Thus, this is how a primary key indicates its use in a table.