在Oracle數據庫中，實現遞歸函數的重載可以通過使用包（package）來實現。以下是一個示例：
CREATE OR REPLACE PACKAGE recursion_package IS
FUNCTION factorial(n NUMBER) RETURN NUMBER;
FUNCTION fibonacci(n NUMBER) RETURN NUMBER;
END recursion_package;
/
CREATE OR REPLACE PACKAGE BODY recursion_package IS
FUNCTION factorial(n NUMBER) RETURN NUMBER IS
BEGIN
IF n = 0 THEN
RETURN 1;
ELSE
RETURN n * factorial(n - 1);
END IF;
END factorial;
FUNCTION fibonacci(n NUMBER) RETURN NUMBER IS
BEGIN
IF n <= 1 THEN
RETURN n;
ELSE
RETURN fibonacci(n - 1) + fibonacci(n - 2);
END IF;
END fibonacci;
END recursion_package;
/
SELECT recursion_package.factorial(5) AS factorial_result FROM dual;
SELECT recursion_package.fibonacci(10) AS fibonacci_result FROM dual;
通過以上方法，可以在Oracle數據庫中實現遞歸函數的重載。
