ORA-00979 不是按表达式分组？

Question

我有以下抛出异常的代码

Ora-00979: Not a group by expression.

即使我删除了 group by 子句，它仍然会报错

ORA-00937: not a single-group group function.

我是这个领域的新手，对连接等方面的知识还不够。如果有人能帮助我解决以下问题，我将不胜感激。

select sDateTime AS Sale_Date, SUM(Amount) AS Sale, SerName 
FROM SALES natural join sales_Description natural join Services 
where ((sDateTime >= to_date('2015-01-01','yyyy-MM-dd')) 
  and (sDateTime <= to_date('2015-01-09','yyyy-MM-dd'))) 
  GROUP BY to_char(sDateTime,'yyyy-MM-dd')

Answer 1

SerName 列未包含在 GROUP BY 子句中。您必须将其包含在 GROUP BY 子句中或将其聚合（MAX、MIN 等）。

尝试将您的查询更改为：

SELECT sDateTime AS Sale_Date, SUM(Amount) AS Sale, SerName 
FROM SALES natural join sales_Description natural join Services 
WHERE ((sDateTime >= to_date('2015-01-01','yyyy-MM-dd')) 
  AND (sDateTime <= to_date('2015-01-09','yyyy-MM-dd'))) 
GROUP BY to_char(sDateTime,'yyyy-MM-dd'), SerName

总之，不知道是不是你想要的结果

Answer 2

第一个错误not a group by是由于以下-

GROUP BY to_char(sDateTime,'yyyy-MM-dd'),.

您需要在 select 中使用相同的 to_char 或将 group by 更改为 sDateTime。

第二次报错not a single-group group错误是因为你删除了group by expression。您需要拥有 select list 的 columns 行，您是 aggregating 行。

尝试以下 -

    SELECT to_char(sDateTime,'yyyy-MM-dd') AS       Sale_Date, 
SerName, 
SUM(Amount) AS Sale
       FROM SALES natural join sales_Description natural join Services 
     WHERE ((sDateTime >= to_date('2015-01-01','yyyy-MM-dd')) 
      AND (sDateTime <= to_date('2015-01-09','yyyy-MM-dd'))) 
       GROUP BY to_char(sDateTime,'yyyy-MM-dd'), SerName

ORA-00979 不是按表达式分组？

ORA-00979 Not a group by expression?

sql

oracle

group-by