title: Check if a value exists in a dataset or column
body: <p>I have a macro program with a loop <code>(for i in 1 to n)</code>. With each <code>i</code> i have a table with many columns - variables. In these columns, we have one named <code>var</code> (who has 3 possible values: a b and c). </p>
  
  <p>So for each table <code>i</code>, I want to check his column <code>var</code> if it exists the value "c". If yes, I want to export this table into a sheet of excel. Otherwise, I will concatenate this table with others. </p>
  
  <p>Can you please tell me how can I do it? </p>