Mysql - 查找评估2列的重复记录

Question

我有一个mysql表，其结构如下： order_id - customer_name - customer_email_address

我需要进行查询以搜索具有相同customer_name或相同customer_email的记录，并显示order_id组排序的结果（降序）。

示例：

Mysql表

order_id    customer_name    customer_email_address
1           pippo            pippo@pippo.com
2           pippo            pippo2@pippo2.com
3           pluto            pluto@pluto.com
4           caio             pippo@pippo.com
5           pippo4           pippo4@pippo4.com
6           pluto            pluto22@pluto22.com

结果

6           pluto            pluto22@pluto22.com
3           pluto            pluto@pluto.com
4           caio             pippo@pippo.com     
1           pippo            pippo@pippo.com
2           pippo            pippo2@pippo2.com

结果6和3共享相同的customer_name 结果4和1共享相同的customer_email_address 结果1和2共享相同的customer_name

Order_id 5不在结果中，因为它没有重复项。

Answer 1

试试这个：

SELECT
    order_id,
    customer_name,
    customer_email_address
FROM 
    my_table
WHERE 
    order_id IN (
        SELECT
            order_id
        FROM
            my_table
        GROUP BY
            customer_name
        HAVING 
            COUNT(*)>1

        UNION

        SELECT
            order_id,
        FROM
            my_table
        GROUP BY
            customer_email_address
        HAVING 
            COUNT(*)>1
    )
ORDER BY 
    customer_name,
    customer_email_address,
    order_id DESC