rspec/rules/S3923/plsql/rule.adoc

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;
----