Primary keys of database programming

Question

What are the primary keys of database programming?

Answer 1

Primary Key:

• The column or columns of the table that value uniquely explains each row into the table is termed as primary key.

• You can describe column as primary key using primary key constraint when you create table.

• While you explain a column as primary key, a unique index is created that restricts duplicate data and quick access to data.

• A column explained as primary key doesn’t permit null value.

• By default, clustered index within created along with the column containing primary key.