title: SQL Command Default Value
body: <p>In my Ms Sql command, I want to get sum of C.HEIGHT's values</p>
  
  <pre><code> SELECT SUM(C.HEIGHT) 
   FROM CIHAZ AS C 
   INNER JOIN ILISKI AS I ON I.REL_CIHAZ=C.ID 
   WHERE I.REL_DOLAP=2
  </code></pre>
  
  <p>This value is returning NULL but I want to give Default Value to  sum(C.HEIGHT) . </p>
  
  <p>How can we provide this?</p>
  
  <p>Thanks.</p>