title: netezza nzload similar function to isnumeric?
body: <p>I have data from a flat file that I am loading into netezza via <code>nzload</code>.  </p>
  
  <p>Some of the field types are numeric however, the data received can sometimes contain invalid characters.</p>
  
  <p>How can i check to make sure that the data <code>isnumeric</code> in my import?  </p>
  
  <p>I saw <code>try_cast</code> for T-Sql but didn't see anything similar in netezza.</p>