Question

当我运行此查询时，Oracle给了我一个错误（ORA-00907：缺少右括号）：

select * 
from reason_for_appointment 
where reason_for_appointment_id in 
(
    select reason_for_appointment_id 
    from appointment_reason 
    where appointment_id = 11 
    order by appointment_reason_id
)

但是，当我只运行子查询时，没有错误。

任何人都可以解释问题是什么吗？

Answer 1

内部查询结果将永远不会显示，因此在嵌套选择中执行顺序没有意义。而是将其应用于外部查询。

Answer 2

问题是在这样的子查询中不允许使用ORDER BY。你为什么想要一个？

Answer 3

看起来您希望使用另一个表中定义的排序显示一个表的结果。内连接应该足够了。

select reason_for_appointment.*
from reason_for_appointment rfa, appointment_reason ar
where rfa.reason_for_appointment_id = ar.reason_for_appointment_id
and ar.appointment_id = 11
order by ar.appointment_reason_id;

Answer 4

从reason_for_appointment中选择*，其中reason_for_appointment_id in（从appointment_reason中选择reason_for_appointment_id，其中appointment_id = 11 by appointment_reason_id）

尝试以下方法：使用辅助作为（从appointment_reason中选择reason_for_appointment_id，其中appointment_id =按order_reason_id排序11）从appointment_reason中选择reason_for_appointment_id，其中reason_for_appointment_id（从辅助中选择reason_for_appointment_id）

Answer 5

如果你的目标是订购输出，你只需要在子查询之外移动ORDER BY：

select * from reason_for_appointment where reason_for_appointment_id in
 (select reason_for_appointment_id from appointment_reason where appointment_id = 11)
 order by reason_for_appointment_id

（我假设你在哪里写了“appointment_reason_id”，你的意思是“reason_for_appointment_id”。如果确实有两个不同的列有这些名字......哎哟。）

Oracle是否允许IN子句中的ORDER BY？

5 个答案: