title: Show mapping based on student access
body: <p>There is a table which has following data:</p>
  <pre><code>student       subject      code
  student1      maths        312
  student1      physics      785
  student2      english      900
  student3      geography    317
  </code></pre>
  <p>I am trying to restrict access to each student in the table to view data specific to their chosen subject. But there is one restriction to show <code>maths</code> data to <code>student2</code>. Thereby both <code>student1</code> and <code>student2</code> both would be able to see <code>maths</code> data, and <em>this mapping has to be done without altering the master data</em>. So only while displaying the table, <code>student2</code> should be mapped to both <code>english</code> and <code>maths</code>.</p>
  <p>Thanks for the help here!</p>