title: Looping a single column to find a match in another worksheet
body: <p>I have two worksheets (Master &amp; Sample).</p>
  
  <p>I want to update the data in Master sheet if I have a value match, unique value in column A of Master sheet with a value in column A in Sample sheet else insert a new row at the end in Master sheet.</p>
  
  <p>What is the logic for this?</p>
  
  <p>I have added sample data for my master and sample in the images.</p>
  
  <p>Example data for Master sheet:</p>
  
  <p><a href="https://i.stack.imgur.com/TjbOW.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/TjbOW.png" alt="enter image description here"></a></p>
  
  <p>Example data for Sample sheet and comments:</p>
  
  <p><a href="https://i.stack.imgur.com/RnK9y.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/RnK9y.png" alt="enter image description here"></a></p>