>>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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