title: mdx - how to replace null values with '0' in measures members
body: <p>In my MDX query I'm using this set of measures in my SELECT statement:</p>
  
  <pre><code>With SET [Selected Measures] AS { 
                                  [Measures].[CTR],
                                  [Measures].[Cost],                                  
                                  [Measures].[Clicks]
                                  }
  </code></pre>
  
  <p>I want in my result to replace the NULL values in '0'.</p>
  
  <p>How to do this?</p>