oracle数据库字符串切割split

create or replace type STR_SPLIT as table of varchar2(50);

CREATE OR REPLACE FUNCTION SPLITSTR(P_STRING
IN VARCHAR2,
P_DELIMITER IN VARCHAR2)
RETURN STR_SPLIT
PIPELINED IS
V_LENGTH NUMBER := LENGTH(P_STRING);
V_START NUMBER := 1;
V_INDEX NUMBER;
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 + 1;
END IF;
END LOOP;

RETURN;
END SPLITSTR;

select * from table(splitstr('Hello,Cnblogs!',','));

select a.column_value v1,b.column_value v2 from
(select * from (select rownum rn,t.* from table(splitstr
('Hello,Cnblogs!',',')) t)) a,
(select * from (select rownum rn,t.* from table(splitstr
('Hello,Cnblogs!',',')) t)) b
where a.rn=1 and b.rn=2;