WM_CONCAT with DISTINCT Clause - Compiled Package versus Stand-Alone Query Issue
- by Reimius
I was writing some program that uses the WM_CONCAT function. When I run this query:
SELECT WM_CONCAT(DISTINCT employee_id)
FROM employee
WHERE ROWNUM < 20;
It works fine. When I try to compile the relatively same query in a package function or procedure, it produces this error: PL/SQL: ORA-30482: DISTINCT option not allowed for this function
FUNCTION fetch_raw_data_by_range
RETURN VARCHAR2 IS
v_some_string VARCHAR2(32000);
BEGIN
SELECT WM_CONCAT(DISTINCT employee_id)
INTO v_some_string
FROM employee
WHERE ROWNUM < 20;
RETURN v_some_string;
END;
I realize WM_CONCAT is not officially supported, but can someone explain why it would work as a stand alone query with DISTINCT, but not compile in a package?
