Why is this an issue?
Having all branches in a CASE or IF/ELSIF chain with the same implementation is an error. Either a
copy-paste error was made and something different should be executed, or there shouldn’t be a CASE/IF/ELSIF
chain at all.
Noncompliant code example
IF param = 1 THEN
result := 'A';
ELSIF param = 2 THEN
result := 'A';
ELSE
result := 'A';
END IF;
result := CASE param
WHEN 1 THEN 'A'
WHEN 2 THEN 'A'
ELSE 'A'
END;
Compliant solution
IF param = 1 THEN
result := 'A';
ELSIF param = 2 THEN
result := 'B';
ELSE
result := 'C';
END IF;
result := CASE param
WHEN 1 THEN 'A'
WHEN 2 THEN 'B'
ELSE 'C'
END;
Exceptions
This rule does not apply to IF/CASE chains without ELSE clauses.
IF param = 1 THEN -- no issue, this could have been done on purpose to make the code more readable
result := 'A';
ELSIF param = 2 THEN
result := 'A';
END IF;
