title: How to compare the cell values of two data tables
body: <p>If i have two data tables with same structure,the same primary key and the same number of columns .</p>
  
  <p>How to compare their <code>content</code> and detect the cells which are not the same in the two data tables ?</p>
  
  <p>ex:</p>
  
  <p><strong>TB_Offline</strong></p>
  
  <pre><code>emp_num(key)  salary      ov    
  
   455           3000      67.891   
   677           5000      89.112    
   778           6000      12.672   
  </code></pre>
  
  <p><strong>TB_Online</strong></p>
  
  <pre><code>emp_num(key)  salary      ov  
  
   455           3000      67.891 
   677           5000      50.113 
   778           5500      12.672   
  </code></pre>
  
  <hr>
  
  <p>I want to get result like this(or some structure to show the differences) :</p>
  
  <pre><code>emp_num(key)| salary_off |salary_on|s1   | ov_off  |  ov_on  |s2         
  
     677      |   5000     |    5000 | 1   |  89.112 |  50.113 | 0    
     778      |   6000     |    5500 | 0   |  12.672 |  12.672 | 1 
  </code></pre>
  
  <hr>
  
  <p><strong>NOTE:</strong></p>
  
  <blockquote>
  <pre><code>455 doesn't exist in the result because it was the exact in all columns among the two datatables.
  </code></pre>
  </blockquote>