未经测试，但应该可以工作：
SELECT
(SELECT value from table where date between DATE1 and DATE2) -
(SELECT value from table where date between DATE3 and DATE4)
FROM dual;
假设您肯定SELECT value会返回一个值
ORACLE SQL获取从2条select语句中检索到的两个值的差
ORACLE SQL获取从2条select语句中检索到的两个值的差
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