title: SQL : select one column if two columns are equal, else select both
body: <p>I have the following SQL select problem:</p>
  
  <p>I have two columns <code>positive threshold</code> and <code>negative threshold</code> (among several other columns like name, ids.... ). </p>
  
  <ul>
  <li><p>If their (absolute) value is the same (multiply by -1) then I want to select only the positive threshold as column <code>[threshold]</code>. </p></li>
  <li><p>If the values are different, I want to select two columns <code>[positiveThreshold]</code> and <code>[negativeThreshold]</code>.</p></li>
  </ul>
  
  <p>Thank you in advance.</p>