我正在努力找到我的错.
我收到此错误消息：
我收到此错误消息：
sql-Fehler: ORA-00904: “S1″.”PARTNO”: ungültiger Bezeichner
00904. 00000 – “%s: invalid identifier”
我检查了我的数据库,所有表都存在.
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
因为您在内部select(s1)partno中别名为“Partno”,所以必须在外部查询中将其称为区分大小写：
select 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"
