ORA - 00936错误，但有能力找到第2行缺少的东西

Question

我试图执行此代码，但它说我缺少一些row_number()表达式，我根本找不到。

with summary as 
(select s.city, length(s.city) as C_length, 
row_number() over (partition by length(s.city), order by s.city) 
as r1 from station s 
where 
length(s.city) = (SELECT min(LENGTH(s1.CITY)) FROM STATION s1) 
or length(s.city) = (SELECT max(LENGTH(s2.CITY)) FROM STATION s2)) 
select su.city, su.C_length 
from summary su; 

Answer 1

不应该有在partition by子句和order by子句之间的逗号。只是删除它，你应该确定：

row_number() over (partition by length(s.city) order by s.city) 
-- Comma removed here ------------------------^ 

Answer 2

您的查询可以简化为：

with summary as (
     select s.city, length(s.city) as C_length, 
      min(length(s.city)) over() as min_length, 
      max(length(s.city)) over() as max_length, 
     from station s 
    ) 
select su.city, su.C_length 
from summary su 
where c_length in (min_length, max_length); 

我删除r1，因为不使用它。