sql - oracle sql开发人员: 00904. 00000- "%s: invalid identifier"。我的错在哪里

Question

我正在尝试找出我的错。
我收到此错误消息:

SQL-Fehler: ORA-00904: "S1"."PARTNO": ungültiger Bezeichner 00904. 00000 - "%s: invalid identifier"

我已经检查了数据库，所有表都存在。

这是我的SQL代码:

select s1.*
 , p.city as "Produktionsort" 
 , p.partname
from (select count(s.partno) as "Anzahl_Produktarten"
        , s.partno as "Partno" 
      from company.supp_part_job s 
      group by s.partno ) s1
 , company.part p 
where s1.partno IN (select p1.partno from company.part p1 where p1.city != 'London') 
   and p.partno = s1.partno 
group by s1.partno

Answer 1

因为您在内部select(s1)partno中将别名别名为"Partno"，所以在外部查询中必须将其称为区分大小写:

select s1.*
 , p.city as "Produktionsort" 
 , p.partname
from (select count(s.partno) as "Anzahl_Produktarten"
        , s.partno as "Partno" 
      from company.supp_part_job s 
      group by s.partno ) s1
 , company.part p 
where s1."Partno" IN (select p1.partno from company.part p1 where p1.city != 'London') 
   and p.partno = s1."Partno" 
group by s1."Partno"