Question

有人可以帮我查明为什么此代码返回SQL Oracle ORA-00904：无效的标识符错误？查询在没有Country ='Argentina'的情况下工作，但我需要按此值过滤。有人能指出我正确的方向吗？

select llattrdata.ID dataid,

max(case when llattrdata.ATTRID = 4 then llattrdata.VALSTR end) Country

from llattrdata, dtree 

where
llattrdata.DEFID = 19400074 and
llattrdata.VERNUM = dtree.VERSIONNUM and
llattrdata.ID = dtree.DATAID and 
Country = 'Argentina'
group by llattrdata.ID

Answer 1

在对分组条件进行过滤时，您需要使用having代替where。

应该是这样的：

select llattrdata.ID dataid,
        max(case when llattrdata.ATTRID = 4 then llattrdata.VALSTR end) Country
  from llattrdata, dtree 
 where llattrdata.DEFID = 19400074 
   and llattrdata.VERNUM = dtree.VERSIONNUM 
   and llattrdata.ID = dtree.DATAID 
 group by llattrdata.ID
having max(case when llattrdata.ATTRID = 4 then llattrdata.VALSTR end) = 'Argentina'

Answer 2

也许我错过了什么，但这与以下不一样：

select distinct
  llattrdata.ID     dataid,
  llattrdata.VALSTR Country
from
  llattrdata,
  dtree 
where
  llattrdata.VERNUM        = dtree.VERSIONNUM and
  llattrdata.ID            = dtree.DATAID     and 
  llattrdata.DEFID         = 19400074         and
  llattrdata.ATTRID        = 4                and
  llattrdata.VALSTRCountry = 'Argentina'

SQL Oracle ORA-00904：无效的标识符错误

2 个答案: