Substr Function Issue

Question

Hello,
I have a following query
Select '||' || RW."Description" || ':' || RW."Reason_Code"
from TMTABLE UL, XMLTABLE('//Row' PASSING UL.TEXT
COLUMNS
"Event" CHAR(10) PATH 'Event',
"Reason_Code" PATH 'Reason_Code',
"Description" PATH 'Description'
) AS RW
WHERE
UL.ID = '[Param.1]' and
UL.QUEUENAME = '[Param.2]' and
RW."Event" = '[Param.3]'
which returns me following result set
||A:00052
||B:00053
||C:00054
||D:00055
||E:00056
But I want all these rows to be concatenated like this : A:00052||B:00053||C:00054||D:00055||E:00056
So I had written following query:
Select substr( (Select '||' || RW."Description" || ':' || RW."Reason_Code"
from TMTABLEUL, XMLTABLE('//Row' PASSING UL.TEXT
COLUMNS
"Event" CHAR(10) PATH 'Event',
"Reason_Code" PATH 'Reason_Code',
"Description" PATH 'Description'
) AS RW
WHERE
UL.ID = '[Param.1]' and
UL.QUEUENAME = '[Param.2]' and
RW."Event" = '[Param.3]' ) , 3 , 2000 ) from Dual
But it gives this error: java.sql.SQLException: ORA-01427: single-row subquery returns more than one row
what should I do to achieve desired result?

Answer 1

Russ,
Thanks for having a look, I think we've got a bit confused. 'Max char fetched' is the item property, you can see in Admin - Disco reserves this space for the column whilst running the query .
Yes, unfortunately we are having to substr all function calls in DB views as Disco defaults to 2000/4000 chars for these items - have a look at some of the standard BIS BAs or see Metalink Note:270273.1 for info. This we can live with and its fixed in 10g...(uuughhh I hate 4i after having done a few 10g implementations). Then we'll remove them after upgrade to help the CPU cause, but it could be many months away.
The current problem that I'm finding strange, is the tripling issue. If a DB view has and item say SUBSTR(emps.employee_longname,1,150) - no function calls involved, this then appears in the folder with the item property 'Max char fetched' as 450 - I would have thought that this should be 150.
In all the years of working with Disco, I never noticed this behaviour before - though I have never looked at it before. I thought I'd give the forum a try b4 raising a SR to see if somebody has encountered this.
thanks,
matt