title: Oracle SQL null plus number give a null value
body: <p>I'm doing some calculation using (+ operations), but i saw that i have some null result, i checked the data base, and i found myself doing something like <code>number+number+nul+number+null+number...=null</code> . and this a problem for me.</p>
  
  <p>there is any suggestion for my problem? how to solve this king for problems ?
  thanks</p>