Question

我需要创建一个查询来返回Customer_ID与其关联的多个Prospect_ID的行。例如，我希望查询返回下面的第2行和第3行，因为Customer_ID是相同的，但Prospect_ID是不同的，但不是第5行和第6行，因为Prospect_ids是相同的：

Prospect_ID   Customer_ID
1001          31001
1002          31002
1003          31002
1004          31003
1005          31004
1005          31004

Answer 1

要获得具有多个不同Customer_id的{{1}}：

Prospect_id

请参阅SQL Fiddle with Demo

如果您想要返回select customer_id from yourtable group by customer_id having count(distinct prospect_id) >1的所有详细信息，那么您可以使用：

Customer_Ids

请参阅SQL Fiddle with Demo。

这也可以写成（感谢@ypercube）：

select *
from yourtable t1
where exists (select customer_id
              from yourtable t2
              where t1.customer_id = t2.customer_id
              group by customer_id
              having count(distinct prospect_id) >1)

请参阅SQL Fiddle with Demo

Answer 2

您可以使用窗口函数执行此操作：

select prospect_id, customer_id
from (select t.*,
             COUNT(*) over (partition by prospect_id, customer_id) as cnt_pc,
             COUNT(*) over (partition by customer_id) as cnt_c
      from t
     ) t
where cnt_pc <> cnt_c and cnt_c > 1

SQL查询逻辑多个记录

2 个答案: