-- refer:

-- http://www.cnblogs.com/gnielee/archive/2009/09/09/1563154.html

-- http://www.cnblogs.com/yudy/archive/2012/07/18/2597874.html

CREATE OR REPLACE TYPE ty_str_split IS TABLE OF VARCHAR2 (4000);

CREATE OR REPLACE FUNCTION splitstr(p_string IN VARCHAR2, p_delimiter IN VARCHAR2  := ',')

    RETURN ty_str_split

    PIPELINED

AS

    v_length   NUMBER := LENGTH(p_string);

    v_start    NUMBER := 1;

    v_index    NUMBER;

    v_length_delimiter NUMBER := LENGTH(p_delimiter);

BEGIN

    WHILE(v_start <= v_length) LOOP

        v_index := INSTR(p_string, p_delimiter, v_start);

        IF v_index = 0 THEN

            PIPE ROW(SUBSTR(p_string, v_start));

            v_start := v_length + 1;

        ELSE

            PIPE ROW(SUBSTR(p_string, v_start, v_index - v_start));

            v_start := v_index + v_length_delimiter;

        END IF;

    END LOOP;

    RETURN;

END splitstr;