如何在 psql 中使用 row_number() 从 table 中删除重复项？

Question

我已经编写了以下查询，我正在使用 greenplum db 和 dbeaver 来实现。

with cte as 
(select 
*, 
row_number() over(partition by first_name order by roll_num) row_num 
from table_name 
where roll_num in ('0011')) 
delete from cte where row_num>1;

以上查询返回错误。请有人能帮我一下！

Answer 1

请尝试这样对我有用：

select *  from tablename as t 
where exists 
      ( select * 
        from tablename as d 
        where d.ctid > t.ctid 
          and d.* is not distinct from t.*
      ) ;

delete from tablename as t 
    where exists 
          ( select * 
            from tablename as d 
            where d.ctid > t.ctid 
              and d.* is not distinct from t.*
          ) ;

Answer 2

这个怎么样：

PostgreSQL DELETE statement with USING clause

参考：PostgreSQL Docs

如何在 psql 中使用 row_number() 从 table 中删除重复项？

How to delete the duplicates from the table using row_number() in psql?

sql

duplicates

greenplum

sql-delete