sql - 在预期的地方找不到 FROM 关键字 - ORA-00923

Question

我有这个简单的 SQL 查询，我试图为一个 uni 项目运行它。我在标题中收到错误，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

你错过了一个, after 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..

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，还应该使用 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