Convert lines to a single column

Hi all


Need help, I have a table where I want the output to a single column

ex: Select in t1. *
the query result_

rownum col_1
1 8217
2 6037
3-5368
4 5543
5 5232

I want the result to be: * 8217,6037,5368,5543,5232 *.


Thank you for your help in advance.

I search the web but couldn't find a solution that is easily understandable.

WM_CONCAT is not documented, so not everyone would want to use it in production code.
However, SYS_CONNECT_BY_PATH might work:

SQL> create table t as
  2  select 1 rn, 8217 count_1 from dual union
  3  select 2, 6037 from dual union
  4  select 3, 5368 from dual union
  5  select 4, 5543 from dual union
  6  select 5, 5232  from dual;

Table created.

SQL> select * from t;

       RN    COUNT_1
--------- ----------
        1       8217
        2       6037
        3       5368
        4       5543
        5       5232

5 rows selected.

SQL>
SQL> select rownum
  2  ,      ltrim(sys_connect_by_path(count_1, ','), ',') count_1
  3  from   t
  4  where  connect_by_isleaf=1
  5  start with t.rn=1
  6  connect by t.rn  = prior t.rn+1;

 ROWNUM
-------
COUNT_1
-------------------------------------------------------------------------------------
      1
8217,6037,5368,5543,5232

1 row selected.

Or LISTAGG on 11.2:

SQL> select listagg(count_1, ',') within group (order by rn) agged from t;

AGGED
-------------------------
8217,6037,5368,5543,5232

1 row selected.

I really hope that you do not really use ROWNUM as column name? I used instead RN...

Tags: Database

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