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Unused parameters should be removed

Unused parameters are misleading. Whatever the value passed to such parameters is, the behavior will be the same.

Noncompliant Code Example​

PROCEDURE do_something(a IN NUMBER, b IN NUMBER) IS -- "b" is unused
BEGIN
  compute(a);
END;

Compliant Solution​

PROCEDURE do_something(a IN NUMBER) IS
BEGIN
  compute(a);
END;