从公司包含 1 到 5 名员工的数据库中选择员工答案

【问题标题】：Selecting employees from database where the company contains between 1 and 5 employees从公司包含 1 到 5 名员工的数据库中选择员工
【发布时间】：2017-05-09 10:00:36
【问题描述】：

到目前为止，我有这个查询：

SELECT
    c.id AS company_id,
    c.company_name,
    COUNT(*) AS employee_count
FROM
    ct_companies c
INNER JOIN ct_employees e ON c.id = e.company_id
GROUP BY
    c.domain,
    c.postcode,
    c.company_name
HAVING
    (
        employee_count >= 1
        AND employee_count <= 5
    )
ORDER BY
    employee_count DESC

现在，这很好用，它会选择至少有 1 名但不超过 5 名员工的公司，并向我显示员工人数。

但我想做的是选择公司内的每个员工，但仅限于该公司拥有 1 到 5 名员工的情况。

类似

SELECT e.id FROM ct_employees e WHERE (employee_count >= 1 AND employee_count <= 5)

【问题讨论】：

标签： mysql

【解决方案1】：

你可以试试

SELECT e.id, 
       d.employee_count 
FROM   ct_employees e 
       INNER JOIN (SELECT c.id     AS company_id, 
                          COUNT(*) AS employee_count 
                   FROM   ct_companies c 
                          INNER JOIN ct_employees e1 
                                  ON c.id = e1.company_id 
                   GROUP  BY c.domain, 
                             c.postcode, 
                             c.id 
                   HAVING COUNT(*) >= 1 
                          AND COUNT(*) <= 5) d 
               ON d.company_id = e.company_id 
ORDER  BY employee_count DESC

【讨论】：