ORA- 00936错误，但可以找到第2行中缺少的内容

Question

我正在尝试执行此代码，但它说我在row_number()表达式中缺少某些内容，我根本无法弄清楚。

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

partition by子句和order by子句之间不应该有逗号。只需删除它，您应该可以：

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：

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);

我删除了r1，因为它没有使用。