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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