title: Constrain two rows to be different
body: <p>I need to add a constraint to a table that will force the values in each row to be different.
  ex.</p>
  
  <pre><code>ID | Column1(int) | Column2(int)
  </code></pre>
  
  <hr>
  
  <pre><code>1  |     5        |    5
  </code></pre>
  
  <hr>
  
  <p>I need to stop this from being allowed.
  Any Ideas on how I can Constrain Column 2 from being the same as Column 1?
  Thanks!</p>