Why are primary keys important when constructing a database?

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Gangaraju Kondapalli

IT Professional Trainer with 12 years of experience in IT Industry

Primary key is used to identify the particular record in entire entity. We can have only one primary key per table and we can use multiple columns in primary key and we called it as composite primary key. If we don't have primary key on table, table will be on heap and will face performance issues.
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