XMLAGG seperator return twice if the value is null

Hi all

I use the xmlagg function to concatenate the values. If the concatenated field is set to NULL, the separator is to come twice.
Please see the sample data below.

CREATE TABLE emp
(
EmpNo NUMBER,
DEPTNO NUMBER (2)
);

INSERT INTO EMP VALUES (1, 10);
INSERT INTO EMP VALUES (1, 20);
INSERT INTO EMP (empno) VALUES (1);
INSERT INTO EMP VALUES (1, 30);

INSERT INTO EMP VALUES (2, 10);
INSERT INTO EMP VALUES (2, 20);
INSERT INTO EMP (empno) VALUES (2);
INSERT INTO EMP VALUES (2, 40);

Select rtrim (xmlagg (xmlelement (e, deptno |))) (('; .extract ')) ('/ / text()'), '; ') group by empno emp
Output-> 10; 30; 20
* 10; 40; 60.

Oracle version is
Oracle Database 11 g Enterprise Edition Release 11.2.0.3.0 - 64 bit Production
PL/SQL Release 11.2.0.3.0 - Production
CORE Production 11.2.0.3.0
AMT for 64-bit Windows: Version 11.2.0.3.0 - Production
NLSRTL Version 11.2.0.3.0 - Production

I don't want to display the separator twice, if the NULL value is there in the concatenated column.

Thanks in advance.

Tahnks,
PAL

You can simply add:

where deptno is not null

but it will filter a single occurrence of empno having no deptno, so this should be better:

select rtrim (
         xmlagg (
           case when deptno is not null then
             xmlelement (e,  deptno || '; ')
           end
         ).extract ('//text()')
       , '; '
       )
from emp
group by empno
;

But perhaps a simpler solution is to use LISTAGG (the aggregate string is however limited to 4 k characters):

select empno
     , listagg(deptno, '; ') within group (order by null) as grp
from emp
group by empno
;

Edited by: odie_63 Apr 30. 2012 10:19

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XMLAGG seperator return twice if the value is null

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