【資料庫SQL實戰】查詢所有員工自入職以來的薪水漲幅情況
阿新 • • 發佈:2019-02-10
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查詢所有員工自入職以來的薪水漲幅情況,給出員工編號emp_noy以及其對應的薪水漲幅growth,並按照growth進行升序
CREATE TABLE employees
(
emp_no
int(11) NOT NULL,
birth_date
date NOT NULL,
first_name
varchar(14) NOT NULL,
last_name
gender
char(1) NOT NULL, hire_date
date NOT NULL, PRIMARY KEY (
emp_no
)); 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
));
建立兩張表,分別存放員工當前工資和員工入職工資,然後將兩表並列查詢。
select a.emp_no,(b.salary-a.salary) as growth
from (select e.emp_no,s.salary
from salaries s,employees e
where s.emp_no=e.emp_no
and s.from_date=e.hire_date) as a,
(select e.emp_no,s.salary
from salaries s,employees e
where s.emp_no=e.emp_no
and s.to_date='9999-01-01' ) as b
where a.emp_no=b.emp_no
order by growth