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Joining column values

Hello

Is it possible to join strings together in a column - eg
say my data set is as

Col1               Col2            
A                    Test1
A                    Test2
B                    Test3
B                    Test4
....what I would like
is
Col1               Col2
A                   Test1 Test2
B                   Test3 Test4
Note: there could be more than 2 rows per grouping as in A & B - probably max of 5

Regards
0
philsivyer
Asked:
philsivyer
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2 Solutions
 
Pratima PharandeCommented:
use function


CREATE OR REPLACE FUNCTION get_employees (p_deptno  in  emp.deptno%TYPE)
  RETURN VARCHAR2
IS
  l_text  VARCHAR2(32767) := NULL;
BEGIN
  FOR cur_rec IN (SELECT ename FROM emp WHERE deptno = p_deptno) LOOP
    l_text := l_text || ',' || cur_rec.ename;
  END LOOP;
  RETURN LTRIM(l_text, ',');
END;
/


Call

SELECT deptno,
       get_employees(deptno) AS employees
FROM   emp
GROUP by deptno;


In your case

Select col1 ,get_employees(col2)
FROM   tablename
GROUP by col1;

refer
http://www.oracle-base.com/articles/misc/StringAggregationTechniques.php
0
 
slightwv (䄆 Netminder) Commented:
In 11gR2 there is a listagg functuon to do this.

I also suggest the XMLAGG method since it doesn't require and procedural code.

If you search this site you will find examples.  I'm on mobile right now and cannot find the link.

I will later if you cannot find an example.
0
 
philsivyerAuthor Commented:
Hello
Would be interested in examples
0
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slightwv (䄆 Netminder) Commented:
Check out below.
drop table tab1 purge;
create table tab1(col1 char(1), col2 varchar2(5));

insert into tab1 values('A','Test1');
insert into tab1 values('A','Test2');
insert into tab1 values('B','Test3');
insert into tab1 values('B','Test4');
commit;

--XML example from: http://www.experts-exchange.com/Database/Oracle/Q_24914739.html?#a25864822
SELECT col1,
       RTRIM(
           EXTRACT(XMLAGG(XMLELEMENT("s", col2 || ' ')), '/s/text()').getstringval(),
           ' '
       )
           col2
FROM tab1
GROUP BY col1
/


select col1, listagg(col2, ' ') within group (order by col2)
from tab1
group by col1
/

Open in new window

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philsivyerAuthor Commented:
Hello

The xmlagg works a treat - the .....
select col1, listagg(col2, ' ') within group (order by col2)
from tab1
group by col1

throws an error......
FROM keyword not found where expected
0
 
slightwv (䄆 Netminder) Commented:
Are you running 11gR2?  Listagg is new for that release.
0
 
philsivyerAuthor Commented:
Yes - running 11gR2
0
 
slightwv (䄆 Netminder) Commented:
I ran the code I posted as-is in 11gR2 sqlplus.  I just ran it again just in case I pasted the wrong code and it ran fine.
0
 
philsivyerAuthor Commented:
Thanks Guys
0
 
philsivyerAuthor Commented:
Using the XMLAGG - Thanks
0

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