在oracle中查找重复值

Question

我正在使用此查询在表中查找重复值:

select col1, 
       count(col1) 
  from table1 
 group by col1 
having count (col1) > 1 
 order by 2 desc;

但是我想在同一个表中添加另一个列,如下所示:

select col1, 
       col2, 
       count(col1) 
  from table1 
 group by col1 
having count (col1) > 1 
 order by 2 desc;

我的ORA-00979第二个查询出错了

如何在搜索中添加其他列？

Answer 1

你的查询应该是

SELECT * FROM (
select col1, 
col2, 
count(col1) over (partition by col1) col1_cnt
from table1 
)
WHERE col1_cnt > 1 
order by 2 desc;