法一:
CREATE TABLE customers
(
customerid SERIAL primary key ,
companyname character varying,
contactname character varying,
phone character varying,
country character varying
)
法二:
CREATE SEQUENCE event_id_seq
START WITH 1
INCREMENT BY 1
NO MINVALUE
NO MAXVALUE
CACHE 1;
alter table event alter column id set default nextval('event_id_seq');
2种方法都可以,第一种简单点。
refurl:http://bbs.youkuaiyun.com/topics/340003365
http://blog.youkuaiyun.com/zezeshenshi/article/details/8542274