title: Generate 5000 records in 2 columns of random number that being unique
body: <p>How I can generate 5000 records in 2 columns of random numbers between 1 and 100 that being unique.</p>
  
  <p>For example:</p>
  
  <pre><code> A            B
  ----------------
   1            98
   1            23
   37           98
   6            56
   93           18
   .            .
   .            .
   .            .
  </code></pre>
  
  <p>thanks</p>