@(跃迁之路)专栏code
- ~
题目描述
查找最晚入职员工的全部信息
CREATE TABLE employees
(emp_no
int(11) NOT NULL,birth_date
date NOT NULL,first_name
varchar(14) NOT NULL,last_name
varchar(16) NOT NULL,gender
char(1) NOT NULL,hire_date
date NOT NULL,
PRIMARY KEY (emp_no
));it
select * from employees where hire_date = (select max(hire_date) from employees)
题目描述
查找入职员工时间排名倒数第三的员工全部信息
CREATE TABLE employees
(emp_no
int(11) NOT NULL,birth_date
date NOT NULL,first_name
varchar(14) NOT NULL,last_name
varchar(16) NOT NULL,gender
char(1) NOT NULL,hire_date
date NOT NULL,
PRIMARY KEY (emp_no
));ast
select * from employees order by hire_date desc limit 2,1;
题目描述
查找各个部门当前(to_date='9999-01-01')领导当前薪水详情以及其对应部门编号dept_no
CREATE TABLE dept_manager
(dept_no
char(4) NOT NULL,emp_no
int(11) NOT NULL,from_date
date NOT NULL,to_date
date NOT NULL,
PRIMARY KEY (emp_no
,dept_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
));date
SELECT s.*, d.dept_no FROM salaries s , dept_manager d WHERE s.to_date='9999-01-01' AND d.to_date='9999-01-01' AND s.emp_no = d.emp_no;