数据库SQL实战:查找员工编号emp_now为10001其自入职以来的薪水salary涨幅值growth(教程)
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2022-05-18 14:32:33
题目描述
查找员工编号emp_now为10001其自入职以来的薪水salary涨幅值growth
create table salaries (
emp_no int(11) not null,
s...
题目描述
查找员工编号emp_now为10001其自入职以来的薪水salary涨幅值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));
1、先分别找到emp_no=10001的员工的第一次工资记录与最后一次工资记录
2、再将最后一次工资记录减去第一次工资记录得到入职以来salary的涨幅,最后用别名growth代替
select (select salary from salaries where emp_no='10001' order by to_date desc limit 1)- (select salary from salaries where emp_no='10001' order by to_date limit 1) as growth