How to compare NULL with NULL

>>Script Language and Platform: SQL
This script will compare NULL with NULL, because NULL is not equal to NULL.

Author: Paul Nersesov

declare
   a number := NULL;
   b number := NULL;
 begin
   if nvl(a, 99999) = nvl(b, 99999) then
      dbms_output.put_line(‘Both values are NULL.’);
   end if;
 end;
—— or
 declare
   a number := NULL;
   b number := NULL;
 begin
   if a IS NULL and b IS NULL then
      dbms_output.put_line(‘Both values are NULL.’);
   end if;
 end;

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