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TIA 提供任何帮助/建议/进一步阅读。

我试图让 SQLDev 计算客户拥有多少包，然后只显示这些结果中的前 10 个。

所以我有这个....

    select  pickup_customer , count (pickup_customer)
from 
( select pickup_customer, count (pickup_customer)
    from manifest
   order by count (pickup_customer) desc ) 
 where ROWNUM <= 10
 group by pickup_customer
 order by count (pickup_customer) desc

有了这个，我得到“不是一个单一的组功能”，我不知道哪里出了问题。可能非常简单的修复，我现在看不到它！

编辑：我已经尝试过这段代码，但现在出现“缺少右括号”错误！

select  pickup_customer , count (pickup_customer)
from 
(select pickup_customer, count (pickup_customer) --sub-query which pre-orders the results for rownum to then limit.
    from manifest
   order by count (pickup_customer) desc 
   group by pickup_customer)
 where ROWNUM <= 10    -- limits the results to be only the top 10
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1 回答 1

2

以下查询应该有效。

SELECT pickup_customer, COUNT (pickup_customer)
FROM enrollment
WHERE ROWNUM <= 10
GROUP BY pickup_customer
ORDER BY COUNT (pickup_customer) DESC
于 2012-11-15T23:22:43.623 回答