SQL48 将所有获取奖金的员工当前的薪水增加10%

描述

请你写出更新语句，将所有获取奖金的员工当前的(salaries.to_date='9999-01-01')薪水增加10%。(emp_bonus里面的emp_no都是当前获奖的所有员工)
create table emp_bonus(
emp_no int not null,
btype smallint not null);
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`));

如：

INSERT INTO emp_bonus VALUES (10001,1);
INSERT INTO salaries VALUES(10001,85097,'2001-06-22','2002-06-22');
INSERT INTO salaries VALUES(10001,88958,'2002-06-22','9999-01-01');

 

更新后的结果:

salaries:

emp_no	salary	from_date	to_date
10001	85097	2001-06-22	2002-06-22
10001	97853.8	2002-06-22	9999-01-01

 

 

 

方法1：连接查询（先join两张表）

update salaries as s join emp_bonus as e on s.emp_no=e.emp_no
set salary=salary*1.1
where to_date='9999-01-01'

方法2：子查询（两次select）

UPDATE salaries SET salary = salary*1.1
WHERE to_date = '9999-01-01' AND salaries.emp_no IN (
    SELECT emp_no FROM emp_bonus
)