create tablespace spname datafile 'c:\oracle\spname.ora' size 10M; create user uname identified by upassword default tablespace spname; grant connect,resource to uname; connect uname/upassword;
第一步：创建SEQUENCE create sequence s_country_id increment by 1 start with 1 maxvalue 999999999; 第二步：创建一个基于该表的before insert 触发器，在触发器中使用该SEQUENCE create or replace trigger bef_ins_t_country_define before insert on t_country_define referencing old as old new as new for each row begin select s_country_id.nextval into :new.country_id from dual; end; /
size 10M;
create user uname identified by upassword default tablespace spname;
grant connect,resource to uname;
connect uname/upassword;
create sequence s_country_id increment by 1 start with 1 maxvalue 999999999;
第二步：创建一个基于该表的before insert 触发器，在触发器中使用该SEQUENCE
create or replace trigger bef_ins_t_country_define
before insert on t_country_define
referencing old as old new as new for each row
begin
select s_country_id.nextval into :new.country_id from dual;
end;
/