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Exercise 5:579.Find Cumulative Salary Of An Employee Problem

1.Description

The Employee table holds the salary information in a year.
Write a SQL to get the cumulative sum of an employee’s salary over a period of 3 months but exclude the most recent month.
The result should be displayed by ‘Id’ ascending, and then by ‘Month’ descending.
Example Input
| Id | Month | Salary |
|----|-------|--------|
| 1 | 1 | 20 |
| 2 | 1 | 20 |
| 1 | 2 | 30 |
| 2 | 2 | 30 |
| 3 | 2 | 40 |
| 1 | 3 | 40 |
| 3 | 3 | 60 |
| 1 | 4 | 60 |
| 3 | 4 | 70 |
Output
| Id | Month | Salary |
|----|-------|--------|
| 1 | 3 | 90 |
| 1 | 2 | 50 |
| 1 | 1 | 20 |
| 2 | 1 | 20 |
| 3 | 3 | 100 |
| 3 | 2 | 40 |
Explanation:Employee ‘1’ has 3 salary records for the following 3 months except the most recent month ‘4’: salary 40 for month ‘3’, 30 for month ‘2’ and 20 for month ‘1’ So the cumulative sum of salary of this employee over 3 months is 90(40+30+20), 50(30+20) and 20 respectively.
| Id | Month | Salary |
|----|-------|--------|
| 1 | 3 | 90 |
| 1 | 2 | 50 |
| 1 | 1 | 20 |
Employee ‘2’ only has one salary record (month ‘1’) except its most recent month ‘2’.
| Id | Month | Salary |
|----|-------|--------|
| 2 | 1 | 20 |
Employ ‘3’ has two salary records except its most recent pay month ‘4’: month ‘3’ with 60 and month ‘2’ with 40. So the cumulative salary is as following.
| Id | Month | Salary |
|----|-------|--------|
| 3 | 3 | 100 |
| 3 | 2 | 40 |

2.Create Table and insert into values

create table if not exists leetcode.ex_579_employee
(
id int,
month int,
salary int
) stored as orc ;
INSERT INTO table leetcode.ex_579_employee VALUES
('1' , '1' ,'20'),
('2' , '1' ,'20'),
('1' , '2' ,'30'),
('2' , '2' ,'30' ),
('3' , '2' ,'40' ),
('1' , '3' ,'40' ),
('3' , '3' ,'60' ),
('1' , '4' ,'60' ),
('3' , '3' ,'70' )