title: What is the difference between logical schema and physical schema?
body: <p>While going through Database architecture I came across Schema's . I am very much confused with:</p>
  
  <p><strong>Logical schema</strong></p>
  
  <p><strong>Physical schema</strong></p>
  
  <p><em>How these two schema exist in the Database?</em></p>
  
  <p><em>How can these be manipulated according to need?</em></p>
  
  <p><em>How Logical schema and physical schema are related?</em></p>