title: How Database stores data internally in B-Tree/B+Tree
body: <p>My question is that How database stores data and how it performs query internally.</p>
  
  <p>Suppose we have following fields in our table:</p>
  
  <ol>
  <li>ID</li>
  <li>Name</li>
  <li>Age</li>
  <li>Weight</li>
  <li>Manager</li>
  </ol>
  
  <p>and we query <code>select * from Table1 where age&gt;50 and weight&lt;100</code></p>
  
  <p>I am just curious that how it perform query internally. </p>
  
  <p>What will the Node of B-Tre/B+Tree contains in this example?</p>