Row to column comma seperated

Question

CREATE TABLE Colors
Color VARCHAR(32)
INSERT into Colors SELECT 'red' from dual
INSERT into Colors SELECT 'orange' from dual
INSERT into Colors SELECT 'blue' from dual
INSERT into Colors SELECT 'green' from dual
Can i do this with out any cursor or loop or a plsql block? can we use some recursive mechanisms like start with connect by

Answer 1

You mean like this?
In 11gR2.
WITH t AS
(SELECT 'red' color
    FROM dual
  UNION ALL
  SELECT 'orange'
    FROM dual
  UNION ALL
  SELECT 'blue'
    FROM dual
  UNION ALL
  SELECT 'green' FROM dual)
SELECT listagg (color, ',') within group (order by 1) FROM t;
SQL> WITH t AS
  2   (SELECT 'red' color
  3      FROM dual
  4    UNION ALL
  5    SELECT 'orange'
  6      FROM dual
  7    UNION ALL
  8    SELECT 'blue'
  9      FROM dual
10    UNION ALL
11    SELECT 'green' FROM dual)
12  SELECT listagg(color, ',') within GROUP(ORDER BY 1) colors FROM t;
COLORS
blue,green,orange,red
SQL>
SQL> select * from v$version;
BANNER
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 - 64bit Production
PL/SQL Release 11.2.0.1.0 - Production
CORE    11.2.0.1.0      Production
TNS for Linux: Version 11.2.0.1.0 - Production
NLSRTL Version 11.2.0.1.0 - ProductionEdited by: RPuttagunta on Nov 19, 2010 4:39 PM
Added more info.