Oracle新手错误：ORA-00904使用“case-when”时标识符无效

我在查询中遇到一个错误。此查询正常，返回用于分页的selects和rownums数据：

select *
from (select a.*, rownum rnum
from (select id_edition, id_document, name, extension, creation_date, url, 
(select inscription_date from edition_student_d0 where id_edition = 12345 and id_third =     12345) inscription_date
from upd_edition_doc_d0
where id_edition = 1071591
order by creation_date desc) a
where rownum <= 10 )
where rnum >= 1

我想这是因为我要求在同一查询级别上使用铭文_date，但我不知道如何处理这个问题

还有，我怎样才能做我想做的？我的意思是，只有在一定条件下才能获取url

有人能帮忙吗

---

提前感谢。

您不能在同一查询级别中引用别名

您可以替换子查询

select *
from (select a.*, rownum rnum
  from (select id_edition, id_document, name, extension, creation_date, 
           (select inscription_date from edition_student_d0 where id_edition = 12345 and  id_third = 12345) inscription_date,
           case when trunc((select inscription_date from edition_student_d0 where id_edition = 12345 and  id_third = 12345) + 90) <= trunc(sysdate) then null
             else url
           end as url
           from upd_edition_doc_d0
           where id_edition = 1071591
           order by creation_date desc) a
   where rownum <= 10 )
where rnum >= 1

或者把箱子上移一层

select *
from (select a.*, 
      case when trunc(inscription_date + 90) <= trunc(sysdate) then null
       else url
      end as url,
      rownum rnum
  from (select id_edition, id_document, name, extension, creation_date, 
           (select inscription_date from edition_student_d0 where id_edition = 12345 and  id_third = 12345) inscription_date
           from upd_edition_doc_d0
           where id_edition = 1071591
           order by creation_date desc) a
   where rownum <= 10 )
where rnum >= 1

---

在我自己尝试之后，我找到了你的第一个解决方案，没有第一个选择的题词。。。。但第二种解决方案是最优雅的，我稍后会尝试！非常感谢你：

select *
from (select a.*, rownum rnum
  from (select id_edition, id_document, name, extension, creation_date, 
           (select inscription_date from edition_student_d0 where id_edition = 12345 and  id_third = 12345) inscription_date,
           case when trunc((select inscription_date from edition_student_d0 where id_edition = 12345 and  id_third = 12345) + 90) <= trunc(sysdate) then null
             else url
           end as url
           from upd_edition_doc_d0
           where id_edition = 1071591
           order by creation_date desc) a
   where rownum <= 10 )
where rnum >= 1

select *
from (select a.*, 
      case when trunc(inscription_date + 90) <= trunc(sysdate) then null
       else url
      end as url,
      rownum rnum
  from (select id_edition, id_document, name, extension, creation_date, 
           (select inscription_date from edition_student_d0 where id_edition = 12345 and  id_third = 12345) inscription_date
           from upd_edition_doc_d0
           where id_edition = 1071591
           order by creation_date desc) a
   where rownum <= 10 )
where rnum >= 1