如何获取第二个表中有两个电话号码的员工姓名和身份证

【问题标题】：How to get employee name and id who have two phone numbers in second table如何获取第二个表中有两个电话号码的员工姓名和身份证
【发布时间】：2017-02-07 10:07:22
【问题描述】：

这是两个表 1.emp_table，2.phone_table。如何获取第二个表中有两个电话号码的员工姓名和身份证

【问题讨论】：

标签： join common-table-expression derived-table

【解决方案1】：

SELECT t1.id,
       t1.name
FROM emp_table t1
INNER JOIN                   -- the join will remove employees who do not have
(                            -- two phone numbers in phone_table
    SELECT Id
    FROM phone_table         -- this query identifies all employees
    GROUP BY Id              -- having two phone numbers in phone_table
    HAVING COUNT(*) = 2
) t2
    ON t1.id = t2.Id

【讨论】：