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4.查找所有已经分配部门的员工的last_name和first_name.md 728 Bytes
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xuthus authored 2019-08-13 08:38 . revise:content revision

查找所有已经分配部门的员工的last_name和first_name

题目描述

查找所有已经分配部门的员工的last_name 和 first_name

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`));

答案

select last_name,first_name,dept_no from employees inner join dept_emp de on employees.emp_no = de.emp_no

题解

inner join的用法

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