How to assign concatenated output to an item on page load

Question

Hi,
I have a table that reads something like this
City Route
NewYork 2
NewYork 4
NewYork 5
London A
London B
Paris X1
I want to assign Routes (concatenated) to an item on page load... as an example for NewYork it should read like this
P2_ROUTE = 2, 4, 5
I am looking to do the above using query, something like this
select (concatenated route)
from Table_A
where
City = :P2_City
any suggestions how to concatenate variables.?

Answer 1

tparvaiz wrote:
I am looking to do the above using query, something like this
select (concatenated route)
from Table_A
where
City = :P2_City
any suggestions how to concatenate variables.?Yes. This is known as string aggregation, and there are many ways to do it. For example:
  Oracle 11.2; list length <= 4000 bytes
SQL> select
  2      l.city
  3    , listagg(d.department_id, ', ')
  4        within group (
  5          order by d.department_id) departments
  6  from
  7      locations l
  8        join departments d
  9          on l.location_id = d.location_id
10  group by
11*      l.city;
CITY                      DEPARTMENTS
Bern                      240
Bombay                      230
Geneva                      90, 100, 110, 120
Hiroshima                 170
London                      40, 260
Munich                      70
Oxford                      80
Seattle                  10, 30, 130, 140, 180, 190, 210, 250
South Brunswick             150, 160
South San Francisco            60
Southlake                 50
Stretford                 270
Tokyo                      220
Toronto                  20
Utrecht                  200
15 rows selected.
  Previous versions or 11.2 list length > 4000 bytes
SQL> select
  2      l.city
  3    , rtrim(
  4          xmlserialize(
  5           content
  6           xmlagg(
  7               xmlparse(content d.department_id || ', ')
  8               order by d.department_id))
  9        , ', ') departments
10  from
11      locations l
12        join departments d
13          on l.location_id = d.location_id
14  group by
15*      l.city;
CITY                      DEPARTMENTS
Bern                      240
Bombay                      230
Geneva                      90, 100, 110, 120
Hiroshima                 170
London                      40, 260
Munich                      70
Oxford                      80
Seattle                  10, 30, 130, 140, 180, 190, 210, 250
South Brunswick             150, 160
South San Francisco            60
Southlake                 50
Stretford                 270
Tokyo                      220
Toronto                  20
Utrecht                  200
15 rows selected.See Re: 4. How do I convert rows to columns? and here for more.