title: Count non empty rows mysql
body: <p>How to count non empty rows from 'naziv_operacije'? You can see table on the picture</p>
  
  <p><a href="https://i.stack.imgur.com/HACSk.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/HACSk.png" alt="Image"></a></p>