需要为主键创建一个序列：

在创建表之后，创建sequence

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');

CREATE SEQUENCE article_keywords_id_seq
 INCREMENT 1
 MINVALUE 1
 MAXVALUE 9223372036854775807
 START 16
 CACHE 1;
ALTER TABLE article_keywords_id_seq
 OWNER TO postgres;