title: Excel difference between cells in two tables
body: <p>I want to compare two tables in Excel 2010, and see the differences in the numeric cells in a third table?</p>
  
  <p>Here is an example of the initial tables:</p>
  
  <pre><code>table 1
  name    value   category
  aa      1.0     red
  
  table 2
  name    category value
  bb      blue     1.0
  </code></pre>