Question

我遇到了复杂的MySQL查询。我有以下表格：

[employee]
id
name

[department]
id
name

[employee_department_relation]
id
employee_id
department_id

[attendance]
id
employee_id
date

注意：仅当员工在该日期在场时才会记录出勤率。没有为abseentism设置特定标志。

我需要知道，特定日期缺少哪些部门的员工。

到目前为止，我已经完成了SQL，但是，它并不完美：

SELECT A.date, 
(SELECT name FROM employee WHERE id = emp_id) AS employee,
(SELECT D.name AS dept_name
 FROM deptartment D
 INNER JOIN employee_department_relation R ON R.dept_id = D.id
 INNER JOIN employee E ON E.id = R.emp_id
 WHERE R.emp_id = A.emp_id
 ) AS dept
FROM attendance A
WHERE A.date = '2014-07-03'

我该怎么办？

Answer 1

根据需要尝试更改日期：

select employee.name, department.name from employee
left join employee_department_relation r on r.employee_id = employee.id
left join department on department.id = r.department_id
where employee.id not in (
    select employee_id from attendance where date = '2014-07-28'
)

如何编写MySQL查询来检测丢失（缺席）记录？

1 个答案: