postgresql如何让主键自增

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.csdn.net/topics/340003365

http://blog.csdn.net/zezeshenshi/article/details/8542274

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