title: Get first unique entry
body: <p>I have the following three columns as data:</p>
  
  <p><img src="https://i.stack.imgur.com/PY1pb.png" alt="enter image description here"></p>
  
  <p>I am using the formula <code>=IF(COUNTIFS($A:$A;A2;$B:$B;B2;$C:$C;C2)=1;1;0)</code> as my output in the <code>Output</code> column. Basically I am giving a <code>non-unique</code> row a <code>0</code> and a <code>unique</code> row a <code>1</code>.</p>
  
  <p>However as you can see I want to give the first occurency of a unique combination of <code>ART</code>, <code>Date</code> and <code>ISIN</code> an 1 and the rest a 0. Why is my currently used formula wrong?</p>
  
  <p>I appreciate your answer!</p>