水电费管理系统需求分析----表格的建立（ 电费表和价格表有待完善......）

--建立用户信息表
create table users
(
   users_id  varchar2(12) not null,
   users_name varchar2(12) not null,
   users_username varchar2(6) not null,
   users_userpassword varchar2(6) not null,
   users_phone number(11) not null,
   users_address varchar2(60) not null   
)
--添加注释
comment on column users.users_id
    is ‘用户编号（主键）‘;
comment on column users.users_name
    is ‘用户姓名‘;
comment on column users.users_username
    is ‘用户账户登录名‘;
comment on column users.users_userpassword
    is ‘用户账户登录密码‘;
comment on column users.users_phone
    is ‘用户联系方式‘;
comment on column users.users_address
    is ‘用户住址‘;
    
--添加主键约束
alter table users add constraint PK_users primary key (users_id)
    
--给登录名添加唯一约束
alter table users add constraint UK_users unique (users_username);

--添加三个信息
insert into users values(‘001‘,‘张三‘,‘zhangs‘,‘666666‘,‘18865472008‘,‘阳光小区15号楼1单元102‘);
insert into users values(‘002‘,‘李四‘,‘lisi01‘,‘666666‘,‘18865472009‘,‘阳光小区14号楼1单元301‘);
insert into users values(‘003‘,‘王五‘,‘wangwu‘,‘666666‘,‘18865472010‘,‘阳光小区8号楼1单元402‘);
--查看一下新建的users表
select * from users

--建立水费缴纳情况信息表
create table water
(
   users_id  varchar2(12) not null,       
   water_sfjf varchar2(3)  not null,
   water_time date,
   water_count number(9,2) not null,
   water_price number(9,2) not null,
   water_money number(9,2) not null,
   water_before number(9,2) not null
   
)
--添加注释
comment on column water.users_id
    is ‘用户编号（外键）‘;
comment on column water.water_sfjf
    is ‘上月是否缴纳水费‘;
comment on column water.water_time
    is ‘缴费时间‘;
comment on column water.water_count
    is ‘用水量（吨）‘;
comment on column water.water_price
    is ‘单价‘;
comment on column water.water_money
    is ‘本次应缴金额‘;
comment on column water.water_before
    is ‘截止上月共缴水费‘;
    
--添加外键
alter table WATER add constraint FK_WATER foreign key (USERS_ID);


--添加几个水费缴纳情况的信息信息
insert into water values(‘001‘,‘是‘,sysdate,‘12.3‘,‘0.5‘,‘6.15‘,‘275.5‘);
insert into water values(‘002‘,‘是‘,sysdate,‘16‘,‘0.5‘,‘8‘,‘395.7‘);
insert into water values(‘003‘,‘否‘,‘‘,‘6‘,‘0.5‘,‘3‘,‘78.6‘);

--查看一下新建的admin表
select * from water