How to get rows values in a column only ?

Question

How to get all returned values in rows in a column.
e.g., a query gives output as :
123
234
233
12121
all in different rows. But i want the result like this:
123,234,233,12121.All in a single row and a single column .
How is this possible ?

Answer 1

prakash wrote:
hi ,
Use the following example
CREATE or  replace  FUNCTION fn_return_row
RETURN VARCHAR2
IS
v_row   VARCHAR2 (32767);
BEGIN
FOR curr_row IN (SELECT ename
FROM emp11)
LOOP
v_row := v_row ||','|| curr_row.ename;
END LOOP;
RETURN v_row;
EXCEPTION
WHEN OTHERS
THEN
RETURN NULL;
END fn_return_row;
select fn_return_row from dual ;Thanks,
P PrakashThere's no need to use PL/SQL when SQL provides adequate functionality to do it.
The title of the thread is misleading as turning rows into columns is called pivoting, but the description of the issue wanting to join all the rows together into a single column, is actually called string aggregation.
As already demonstrated it can be done several ways.
1. with XML functionality
2. using the SYS_CONNECT_BY_PATH method
and if you have 11gR2, there's...
3. the new LISTAGG analytical function.
There is also an undocumented WMSYS.WM_CONCAT function, though this isn't as flexible as other methods in that you can't control the order of the aggregated data so easily, and using such undocumented functions in production code is dangerous, as the functionality could change in future versions of Oracle, as well as it's use making your code such that Oracle will not provide support if the code with issue is using it.