是否有可以退回不同数量产品的功能？

Question

我有一张桌子

SKU COUNT
A   2
A   2
A   2
B   2
B   1
C   3
C   3
C   3

我想返回计数不同的SKU

这是针对Oracle数据库的SQL查询

Return SKU COUNT
       B   2 
       B   1

Answer 1

尝试一下：

select sku, count(distinct count)
from my_table 
group by sku 
having count(distinct count) > 1

Answer 2

一种简单的方法使用exists：

select t.*
from t
where exists (select 1 from t t2 where t2.sku = t.sku and t2.count <> t.count);

Answer 3

您可以使用子查询来查找草图。例如：

select * 
from t
where sku in (select sku from t group by sku having min(count) <> max(count))

Answer 4

您可以使用count（distinct count）来托盘

 select sku, count, count(distinct count)
 from my_table 
 group by  sku, count 
 having count(distinct count) > 1