Question

我有一个名为“ phone_number_list”的表，该表具有id，phone_number，org_id和created_at。我正在尝试运行一个查询，该查询将删除表中每个org_id的重复的phone_number。谁能帮我这个？我知道如何使用MySQL进行此操作，但是第一次使用Postgresql。

Answer 1

尝试一下：

delete from your_table where id in 
   (select max(id) from your_table
     group by org_id, phone_number
     having count(1) > 1);

Querying soft deleted models。运行正常。

Answer 2

这是使用“窗口函数”的解决方案：

DELETE FROM phone_number_list 
 WHERE id IN 
    (SELECT id FROM 
       ( SELECT id, ROW_NUMBER() OVER 
         (partition BY phone_number, org_id ORDER BY id ASC) AS rnum
         FROM phone_number_list
       ) AS t WHERE t.rnum > 1);

如何在Postgresql中删除重复的行？

2 个答案: