This rule applies whenever an IF statement is followed by one or
more ELSEIF statements; the final ELSEIF should be followed by an ELSE statement.
The requirement for a final ELSE statement is defensive programming.
The ELSE statement should either take appropriate action or contain
a suitable comment as to why no action is taken. This is consistent with the
requirement to have a final ELSE clause in a CASE
statement.
Noncompliant code example
IF my_variable = 0 THEN
do_something;
ELSIF my_variable = 1 THEN
do_something_else;
END IF;
Compliant solution
IF my_variable = 0 THEN
do_something;
ELSIF my_variable = 1 THEN
do_something_else;
ELSE
-- Nothing has to be done.
NULL;
END IF;
