Oracle Select语句中薪金的差异

问题描述

我在下表中有三列（Empno，Ename，Salary）

Empno  Ename  Salary 
101    Ashok  1000
102    Kumar  2000
103    Mani   3000

我需要通过显示薪水差异来在“输出”下面。

Empno Ename  Salary  Difference_in_Salary
101   Ashok  1000     1000
102   Kumar  2000     1000
103   Mani   3000     1000

解决方法

计算“差异”的方法有很多，因为它取决于您想要的差异：

SELECT t.*,ABS( salary - AVG( salary ) OVER () )                  AS difference_from_avg,LEAD( salary ) OVER ( ORDER BY salary ) - salary       AS difference_from_next,salary - LAG( salary,1,0 ) OVER ( ORDER BY salary )  AS difference_from_prev,salary - MIN( salary ) OVER ()                         AS difference_from_min,MAX( salary ) OVER () - salary                         AS difference_from_max
FROM   table_name t

其中，为您的示例数据：

CREATE TABLE table_name ( Empno,Ename,Salary ) AS 
SELECT 101,'Ashok',1000 FROM DUAL UNION ALL
SELECT 102,'Kumar',2000 FROM DUAL UNION ALL
SELECT 103,'Mani',3000 FROM DUAL;

输出：

EMPNO | ENAME | SALARY | DIFFERENCE_FROM_AVG | DIFFERENCE_FROM_NEXT | DIFFERENCE_FROM_PREV | DIFFERENCE_FROM_MIN | DIFFERENCE_FROM_MAX
----: | :---- | -----: | ------------------: | -------------------: | -------------------: | ------------------: | ------------------:
  101 | Ashok |   1000 |                1000 |                 1000 |                 1000 |                   0 |                2000
  102 | Kumar |   2000 |                   0 |                 1000 |                 1000 |                1000 |                1000
  103 | Mani  |   3000 |                1000 |                 null |                 1000 |                2000 |                   0

db 提琴here