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57.使用含有关键字exists查找未分配具体部门的员工的所有信息.md 739 Bytes
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xuthus authored 2019-08-13 08:38 . revise:content revision

使用含有关键字exists查找未分配具体部门的员工的所有信息

题目描述

使用含有关键字exists查找未分配具体部门的员工的所有信息。

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`));
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`));

答案

select * from employees e1 where not exists (select * from dept_emp de where e1.emp_no = de.emp_no)

题解

子查询

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