At most one declaration of a variable in a given scope is allowed in PL/SQL. The ``++PLS-00371++`` error will be raised at runtime when attempting to reference a variable declared more than once.


== Noncompliant Code Example

----
SET SERVEROUTPUT ON

DECLARE
  foo VARCHAR2(42) := 'foo';
  foo VARCHAR2(42) := 'bar'; -- Non-Compliant
BEGIN
  DBMS_OUTPUT.PUT_LINE(foo); -- Raises PLS-00371: at most one declaration for 'FOO' is permitted
END;
/
----


== Compliant Solution

----
SET SERVEROUTPUT ON

DECLARE
  foo VARCHAR2(42) := 'foo';
  bar VARCHAR2(42) := 'bar'; -- Compliant
BEGIN
  DBMS_OUTPUT.PUT_LINE(foo);
END;
/
----

