Question

Can anybody help me pinpoint why this code is returning an SQL Oracle ORA-00904: invalid indentifier error? The query works without the Country = ‘Argentina’, but I need to filter down by this value. Can anyone point me in the right direction?

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

When you are filtering on grouped conditions, you need to use having instead of where.

It should be something like:

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'