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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