--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);