What is the utility of primary key in database? Write distinct features of primary keys.
What is the utility of primary key in database? Write distinct features of primary keys.
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The primary key is used to uniquely identify the record in a database. It can be a column or a set of columns in the table.
Main features of the primary key are as follows:
1. It must contain a unique value for each record of the table.
2. It does not contain null values.
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