title: POSTGRES - add whitespace
body: <p>I have a column called item and I would like to add whitespace at the START of each row in the item column.</p>
  
  <p>I would also like to remove the 3 and insert the result into a new column called item_n.</p>
  
  <pre><code>item                 item_n
  -------------------|-----------
  to go 3            |
  1 2 3              |
  cat dog 3          |
  blah blah 3
  </code></pre>
  
  <p>RESULT:</p>
  
  <pre><code>item          |  item_n
  ------------------------------
  to go 3       | to go
  1 2 3         | 1 2
  cat dog 3     | cat dog
  blah blah 3   | blah blah
  </code></pre>
  
  <p>Thanks in advance</p>