數據庫SQL實戰（牛客網）：查找員工編號emp_no爲10001其自入職以來的薪水salary漲幅值growth

查找員工編號emp_no爲10001其自入職以來的薪水salary漲幅值growth
CREATE TABLE salaries (
emp_no int(11) NOT NULL,
salary int(11) NOT NULL,
from_date date NOT NULL,
to_date date NOT NULL,
PRIMARY KEY (emp_no,from_date));

–select 也可以這麼用：將to_date 最大值（當前）的薪水-to_date 最小值（入職當天）的薪水拿到

select
((select salary 
from salaries 
where emp_no = 10001 
order by to_date desc
limit 0,1)
-
(select salary 
from salaries 
where emp_no = 10001 
order by to_date asc
limit 0,1))
as growth;