title: How to make subcolumns in sql
body: <p>How do i make subcolums un select sql like this</p>
  
  <pre><code>       Column1              |  Column2           |      Column3        |
         | cat1 | cat2 | cat3 | cat1 | cat2 | cat3 | cat1 | cat2 | cat3  |
  row1   |  2   |  3   |  1   |   1  |   2  |   0  |   2  |  1   |   0   |
  row2   |  7   |  5   |  7   |   2  |   4  |   1  |   0  |  1   |   2   |
  row3   |  3   |  0   |  3   |   3  |   8  |   0  |   2  |  0   |   2   |
  </code></pre>