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