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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