title: What’s the difference between a primary key and a clustered index?
body: <blockquote>
    <p><strong>Possible Duplicate:</strong><br>
    <a href="https://stackoverflow.com/questions/11546688/performance-difference-between-primary-key-and-unique-clustered-index-in-sql-ser">Performance difference between Primary Key and Unique Clustered Index in SQL Server</a>  </p>
  </blockquote>
  
  
  
  <p>I make sure that I searched this forum but nobody asked this question before and I couldn't find any answer in anywhere too.</p>
  
  <p>My question is = "What’s the difference between a primary key and a clustered index?"</p>