title: Convert varchar to numeric in vertica
body: <p>Is It possible to change <code>varchar(10)</code> column to data type <code>numeric(10,4)</code> using alter statement.</p>
  
  <p>I tried it with alter command but getting an arror:</p>
  
  <p><code>cannot convert column from varchar(10) to numeric(10,4)</code></p>