title: How to remove spaces from varchar in Oracle
body: <p>I need to remove all spaces from column values of varchar2 type in an Oracle table. 
  For example, <code>2012_2 psk</code> should become <code>2012_2psk</code>. </p>
  
  <p>I've tried to <code>use REPLACE(column_name, ' ', '')</code> but it doesn't work. <br />
  Can anyone help me?</p>