1.查看全部序列
select * from user_sequences;

2.创建序列
例一：
CREATE SEQUENCE SEQ_PREENTRY_INFO
INCREMENT BY 1 
START WITH 起始
MINVALUE 0  
NOCYCLE 
CACHE 20

例二：
CREATE SEQUENCE SEQ_PREENTRY_INFO_DJ
INCREMENT BY 1 
START WITH 起始值
MINVALUE 0  
NOCYCLE 
CACHE 20

3.修改序列编号递增数值
ALTER SEQUENCE 序列名 INCREMENT BY 起始值;