title: null value is there in the column how to combine
body: <p>fname   lname        id</p>
  
  <pre><code>a       null    101
  null     p      101
   b       null   102
  null      q     102
  c         null  103
  null      r     103
  </code></pre>
  
  <p>i want output like this :`</p>
  
  <p>fname   lname     id</p>
  
  <pre><code>a    p       101
  
  b     q      102
  
  c     r      103
  </code></pre>