title: adding braces to the negative values when subtracted
body: <p>How to add curly braces to the negative value, which will be the result of subtraction of two columns,</p>
  
  <p>Suppose I have three columns</p>
  
  <pre><code>        A      B           result(B-A)
  -----------------------------------------
          1      4             3
  
          2      1            -1 [should be displayed as (1) not -1]
  
          9      3            (6)
  -----------------------------------------
  total   3      5            (4)
  </code></pre>
  
  <p>How to do this in select query?</p>