--删除 drop table dianfei; --创建表 create table dianfei （ uon varchar2(10) not null, mmonth varchar2(6) not null, ddf number(6,2) not null, djftime date not null, djfzt varchar2(3) not null, dsyjf date not null ）; --注释 comment on table dianfei is '电表'; comment on column dianfei.uon is '用户编号(从键)'; comment on column dianfei.mmonth is '缴费月份（从键）'; comment on column dianfei.ddf is '电费金额'; comment on column dianfei.djftime is '缴费日期'; comment on column dianfei.djfzt is '缴费状态'; comment on column dianfei.dsyjf is '上月缴费日期'; --创建主键，从键 alter table dianfei add constraint pk_dianfei foreign key (uon) references uuser (uon); alter table dianfei add constraint pk_dianfeia foreign key (mmonth) references money (mmonth);