hmoban postgresql如何设置主键自增
方法一：
CREATE TABLE customers ( customerid SERIAL primary key , companyname character varying, contactname character varying, phone character varying, country character varying )
方法二：
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');
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