创建一个sequence就可以了。
CREATE SEQUENCE SEQNAME
INCREMENT BY 1
START WITH 1
MAXVALUE 999999
NOMINVALUE
CYCLE
CACHE 20
NOORDER
CREATE SEQUENCE SEQNAME
INCREMENT BY 1
START WITH 1
MAXVALUE 999999
NOMINVALUE
CYCLE
CACHE 20
NOORDER
调试欢乐多
MAXVALUE 1.0E28 MINVALUE 1 NOCYCLE
NOCACHE NOORDER;CREATE OR REPLACE TRIGGER USERADD
BEFORE INSERT ON MEMBERRG
FOR EACH ROW
BEGIN
SELECT LPAD(USERID.NEXTVAL,4,'0') INTO :NEW.NUM FROM DUAL;
END;