oracle 生成 20 位随机数字的函数

-- Create sequence
create sequence SEQU_SOFA_FID
minvalue 1
maxvalue 99999
start with 7
increment by 1
cache 100
cycle;

CREATE OR REPLACE FUNCTION SOFA_NUID RETURN NUMBER IS
RE NUMBER(20);
BEGIN
SELECT TO_NUMBER(TO_CHAR(SYSDATE, 'YYMMDDhh24miSS') ||
LPAD(ABS(MOD(DBMS_RANDOM.RANDOM, 1000)), 3, 0) ||
LPAD(SEQU_SOFA_FID.NEXTVAL, 5, 0))
INTO RE
FROM DUAL;
RETURN RE;
END;