遇到SQL错误：ORA-00979：不是GROUP BY表达式

Question

我使用SQL Fiddle进行小批量测试但是当我将整个数据集输入oracle时会导致SQL错误：ORA-00979：不是GROUP BY表达式。

Select Staff.Number, Staff.Name, Staff.title, Staff.S_Location, 
count(Contact.Number) as X
from Staff
left join Contact
on Staff.Number = Contact.Number
group by Staff.Number
order by X desc;

Answer 1

您需要通过

将Staff.Name，Staff.Title和Staff.S_Location添加到组中