Oracle主键自动增长

--建表 create table PLAN_CONTRACT(id number not null primary key, PLAN_ID number, CONTRACT_ID number); -- 建立序列： -- Create sequence create sequence PLAN_CONTRACT_SEQUENCE minvalue 1 maxvalue 999999999999999999999999999 start with 1 increment by 1 cache 20; -- 建立触发器 create trigger "PLAN_CONTRACT_trigger" before insert on PLAN_CONTRACT for each row when(new.id is null) begin select PLAN_CONTRACT_sequence.nextval into:new.id from dual; end;