--在users表的userid列上實現自動增長列 --需要同時使用序列和行級觸發器create sequence seq_userid; --創建序列 create or replace trigger users_bir --創建行級觸發器 before insert on users for each row declare tempnum number; begin select seq_userid.nextval into tempnum from dual; :new userid := 'Usr' lpda(tempnum,7,'0'); end users_bir ; /
