未找到FROM关键字 - ORA-00923

Question

我有这个简单的SQL查询，我试图为uni项目运行。我收到了标题中的错误但是我运行了一个非常相似的查询，没有问题。

select booking.customer_id, booking_start_date
   SUM(total_cost) sales
from booking
order by 2 desc 

提前致谢。

Answer 1

,之后您错过了booking_start_date。

尝试 -

select booking.customer_id, 
       booking_start_date,
       SUM(total_cost) sales
from booking
GROUP BY booking.customer_id, booking_start_date
order by 2 desc 

Answer 2

尝试以下方法..

select 
    booking.customer_id
    , booking.start_date
    , SUM(booking.total_cost) sales
from
    booking
group by
    booking.customer_id
    , booking.start_date
order by 
    2 desc 

Answer 3

这是您更新的查询。当您使用COUNT，SUM，MIN，MAX等聚合函数时，也应该使用GROUP BY。

select booking.customer_id, booking_start_date
   SUM(total_cost) sales
from booking group by booking.customer_id, booking_start_date
order by 2 desc