title: what is the error in this program?
body: <p>I have write the following pl/sql program and  unable to dectect the error :</p>
  
  <pre><code> declare
   variable a number;
   b number:=2354;
   begin
   b:=:a;
   end;
  </code></pre>
  
  <p>the error in this  is </p>
  
  <blockquote>
    <p>SP2-0552: Bind variable "A" not declared.</p>
  </blockquote>
  
  <p>plz help ...</p>