ORACLE SQL从2个select语句中获取两个值的差异

我们有2个非常简单的SELECT语句：

SELECT value from table where date between DATE1 and DATE2
SELECT value from table where date between DATE3 and DATE4

我们需要一种方法来编写单个SQL语句,它将获得从这两个SQL语句返回的“值”的差异.

我们尝试了以下但是没有成功：

SELECT value from table where date between DATE1 and DATE2
minus 
SELECT value from table where date between DATE3 and DATE4

任何建议都非常感谢.

未经测试但应该工作：

SELECT
    (SELECT value from table where date between DATE1 and DATE2) - 
    (SELECT value from table where date between DATE3 and DATE4)
FROM dual;

假设您的SELECT值保证返回单个值