title: Updating a column in SQL database table when month changes
body: <p><img src="https://i.stack.imgur.com/POMpp.png" alt="enter image description here"></p>
  
  <p>I am working on fee collection system I need to update the value of the <code>FeeDue</code> column when the month changes.</p>
  
  <p>Ex: IF month changed from August to September, <code>FeeDue</code> columns needs to be updated</p>
  
  <p>as  </p>
  
  <pre><code>Value of feedue column = value in fee column + value of feedue column
  </code></pre>
  
  <p>I've tried in many ways but not succeeded</p>