create table admin
（
aid varchar2(10) not null,
apassword  varchar2(8) not null,
aphone  varchar2(11) not null,
aname varchar2(8) not null
）;
comment on table admin is ‘管理员登录‘;
comment on column admin.aid is ‘管理编号(主键)‘;
comment on column admin.apassword is ‘登录密码‘;
comment on column admin.aphone is ‘管理员电话‘;
comment on column admin.aname is ‘管理员姓名‘;
alter table admin add constraint pk_admin primary key (aid);

drop table uuser;

create table uuser
(
uon varchar2(15) not null,
uname varchar2(8) not null,
uphone  varchar2(11) not null,
upassword varchar2(8) not null,
uaddress  varchar2(60) not null

）;
comment on table uuser is ‘用户登录‘;
comment on column uuser.uon is ‘用户编号(主键)‘;
comment on column uuser.uname is ‘用户姓名‘;
comment on column uuser.uphone is ‘用户电话‘;
comment on column uuser.upassword is ‘用户登录密码‘;
comment on column uuser.uaddress is ‘用户地址‘;

alter table uuser add constraint pk_uuser primary key (uon);

drop table dianfei;
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
）;
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‘;

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);

drop table shuifei;
create table shuifei
（
uon varchar2(10) not null,
mmonth  varchar2(6) not null,
sdf number(6,2) not null,
sjftime date not null,
sjfzt varchar2(3) not null,
ssyjf date not null
）;
comment on table shuifei is ‘水表‘;
comment on column shuifei.uon is ‘用户编号(从键)‘;
comment on column shuifei.mmonth is ‘缴费月份（从键）‘;
comment on column shuifei.sdf is ‘水费金额‘;
comment on column shuifei.sjftime is ‘缴费日期‘;
comment on column shuifei.sjfzt is ‘缴费状态‘;
comment on column shuifei.ssyjf is ‘上月缴费日期‘;
alter table shuifei add constraint pk_shuifei foreign key (uon)
references uuser (uon);
alter table shuifei add constraint pk_shuifeia foreign key (mmonth)
references money (mmonth);

drop table money;

create table MONEY
(
  mmonth varchar2(6) not null,
  mwater NUMBER(4,2) not null,
  mpower NUMBER(4,2) not null
);
comment on column MONEY.mmonth
  is ‘缴费月份（主键）‘;
comment on column MONEY.mwater
  is ‘水费价格‘;
comment on column MONEY.mpower
  is ‘电费价格‘;
  alter table MONEY add constraint pk_money primary key (mmonth);