SQL198 查找所有已经分配部门的员工的last_name和first_name以及dept_no
题目描述
有一个员工表,employees简况如下:
emp_no | birth_date | first_name | last_name | gender | hire_date |
---|---|---|---|---|---|
10001 | 1953-09-02 | Georgi | Facello | M | 1986-06-26 |
10002 | 1964-06-02 | Bezalel | Simmel | F | 1985-11-21 |
10003 | 1959-12-03 | Parto | Bamford | M | 1986-08-28 |
10004 | 1954-05-01 | Christian | Koblick | M | 1986-12-01 |
有一个部门表,dept_emp简况如下:
emp_no | dept_no | from_date | to_date |
---|---|---|---|
10001 | d001 | 1986-06-26 | 9999-01-01 |
10002 | d002 | 1989-08-03 | 9999-01-01 |
请你查找所有已经分配部门的员工的last_name和first_name以及dept_no,未分配的部门的员工不显示,以上例子如下:
last_name | first_name | dept_no |
---|---|---|
Facello | Georgi | d001 |
Simmel | Bezalel | d002 |
SQL Schema
sql
drop table if exists `dept_emp` ;
drop table if exists `employees` ;
CREATE TABLE `dept_emp` (
`emp_no` int(11) NOT NULL,
`dept_no` char(4) NOT NULL,
`from_date` date NOT NULL,
`to_date` date NOT NULL,
PRIMARY KEY (`emp_no`,`dept_no`));
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`));
INSERT INTO dept_emp VALUES(10001,'d001','1986-06-26','9999-01-01');
INSERT INTO dept_emp VALUES(10002,'d002','1996-08-03','9999-01-01');
INSERT INTO employees VALUES(10001,'1953-09-02','Georgi','Facello','M','1986-06-26');
INSERT INTO employees VALUES(10002,'1964-06-02','Bezalel','Simmel','F','1985-11-21');
INSERT INTO employees VALUES(10003,'1959-12-03','Parto','Bamford','M','1986-08-28');
INSERT INTO employees VALUES(10004,'1954-05-01','Chirstian','Koblick','M','1986-12-01');
答案
sql
SELECT s.*, dm.dept_no
FROM salaries s
INNER JOIN dept_manager dm on s.emp_no = dm.emp_no
ORDER BY s.emp_no;