计算字符在字符串中出现的次数

CREATE OR REPLACE FUNCTION STR_CNT_NISJ(MOTHER_CHAR VARCHAR2, SUB_CHAR VARCHAR2) RETURN NUMBER IS
V_NUM NUMBER := 0;
BEGIN
SELECT (LENGTHB(MOTHER_CHAR) - LENGTHB(REPLACE(MOTHER_CHAR, SUB_CHAR, ''))) / LENGTHB(SUB_CHAR)
INTO V_NUM
FROM DUAL;
RETURN V_NUM;
END;
/

CREATE OR REPLACE FUNCTION STR_CNT(MOTHER_CHAR VARCHAR2,SUB_CHAR VARCHAR2)
RETURN NUMBER
IS
V_NUM NUMBER(10):=0;
BEGIN
FOR I IN 1..LENGTH(MOTHER_CHAR) LOOP
IF INSTR(MOTHER_CHAR,SUB_CHAR,1,I)>0 THEN
V_NUM:=V_NUM+1;
ELSE
RETURN V_NUM;
END IF;
END LOOP;
RETURN V_NUM;
END;
/