Listagg function and ORA-01489: result of string concatenation is too long

Question

When i run the following query:

 Select
  tm.product_id,
  listagg(tm.book_id || \'(\' || tm.score || \')\',\',\')
    within group (order by tm.product_id)          


        

Answer 1

you can use xml functions to do it which return a CLOB. JDBC should be just fine with that.

select tm.product_id, 
       rtrim(extract(xmlagg(xmlelement(e, tm.book_id || '(' || tm.score || '),')), 
               '/E/text()').getclobval(), ',')
  from tl_product_match tm
 where tm.book_id is not null 
 group by tm.product_id;

eg: http://sqlfiddle.com/#!4/083a2/1

Answer 2

I have seen the alternative example described here - http://www.oracle-base.com/articles/misc/string-aggregation-techniques.php but they all require the use of functions or procedure.

No they don't. Scroll down and you'll see several options that don't require pl/sql.

Answer 3

Why not use nested tables?

set echo on;
set display on;
set linesize 200;

drop table testA;
create table testA
(
col1 number,
col2 varchar2(50)
);

drop table testB;
create table testB
(
col1 number,
col2 varchar2(50)
);

create or replace type t_vchar_tab as table of varchar2(50);

insert into testA values (1,'A');
insert into testA values (2,'B');

insert into testB values (1,'X');
insert into testB values (1,'Y');
insert into testB values (1,'Z');
commit;

-- select all related testB.col2 values in a nested table for each testA.col1 value
select a.col1, 
cast(multiset(select b.col2 from testB b where b.col1 = a.col1 order by b.col2) as t_vchar_tab) as testB_vals
from testA a;

-- test size > 4000
insert into testB
select 2 as col1, substr((object_name || object_type), 1, 50) as col2
from all_objects;
commit;

-- select all related testB.col2 values in a nested table for each testA.col1 value
select a.col1, 
cast(multiset(select b.col2 from testB b where b.col1 = a.col1 order by b.col2) as t_vchar_tab) as testB_vals
from testA a;

I'm no java expert, but this has been around for some time and I'm sure java can pull the values out of the nested table. And, no need to tokenize some delimited string on the other end.