Display results in one row

Question

Query below is returning data in multiple rows, I want to display them as one row:
select
event_id,
data_type_cd,
quantity
from Event,Data_types
where event_id = 1234
and event.DATA_TYPE_ID = data_types.DATA_TYPE_ID
(I want to display data_type_cd concatenated with quantity as every code had different quantity)

Answer 1

  > Sample data is:
  > Data_type_id Quantity
  > ------------------ ----------
  > 1 34
  > 2 67
  > 15 35
  > 20 23
  > I want to display as:
  > 1 34 2 67 15 35 20 23
if you want all the rows in one column see this given example below:
  SQL> select t.*
    2    from (select  1 data_type_id, 34 quantity from dual union all
    3          select  2 data_type_id, 67 quantity from dual union all
    4          select 15 data_type_id, 35 quantity from dual union all
    5          select 20 data_type_id, 23 quantity from dual) t;
  DATA_TYPE_ID   QUANTITY
             1         34
             2         67
            15         35
            20         23
  SQL> select substr(sys_xmlagg(xmlelement(col, ' ' || data_type_id||' '||quantity)).extract('/ROWSET/COL/text()').getclobval(), 2) new_disp
    2    from (select  1 data_type_id, 34 quantity from dual union all
    3          select  2 data_type_id, 67 quantity from dual union all
    4          select 15 data_type_id, 35 quantity from dual union all
    5          select 20 data_type_id, 23 quantity from dual) t;
  NEW_DISP
  1 34 2 67 15 35 20 23
  SQL>