ODI inteface giving error on xmlagg function

Question

Hello,
Oracle DB: 11g r2
ODI :11.1.1.3
I have this following code in SQL and needs to implement in ODI interface
select  rtrim (xmlagg (xmlelement (e, CAT.CATEGORY || ',')).extract ('//text()'), ',') LEVEL_OF_DIFFICULTY from src_schema.category  cat,src_schema.item_category  icat  where  cat.pk=icat.category_pk 
and icat.ASI_PK=E.PK AND CAT.MAIN_PK=E.MAIN_PK AND CAT.TYPE='D' )  LEVEL_OF_DIFFICULTY
Note:_
E alias will be from the base table that's from target data store
I am trying to implement this in ODI as lookup, I have been getting this following error
Caused By: java.sql.SQLSyntaxErrorException: ORA-00937: not a single-group group functionI have tried multiple option as source and staging area, both times i am getting this error
If I put that in target then getting critical error.
Could you please let me know how do I implement this in ODI interface
Thanks,

Answer 1

you're missing the group by.
Also, is playdate a date datatype? If so, then you need to explicitly convert '1-jan-2007' into a date, otherwise you leave yourself open to a bug, should different NLS date settings be applied.
Assuming a date datatype, try the following:
SELECT pd.player_name, MAX(pd.wickets_taken)
FROM   playerdetail pd, teamdetails td
WHERE  pd.types = 'ODI'
AND    td.playdate > to_date('01/01/2007', 'dd/mm/yyyy')
--I suspect you're missing a join condition - something like pd.team_id = td.team_id
GROUP BY pd.player_name;