Oracle 创建自动增长值

Oracle 里面创建唯一键值自动增长 

 

CREATE OR REPLACE SEQUENCE SEQ_ID
  START WITH 1
  MAXVALUE 999
  MINVALUE 1
  NOCYCLE
  CACHE 20
  NOORDER;

 

CREATE OR REPLACE TRIGGER TAB_A_Tri before insert on TAB_A for 
each row
begin select SEQ_ID.nextval into :new.id from dual;
end;