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。