E-R圖：

 相關SQL程式碼如下：

CREATE TABLE Administrator(
    Gname varchar(50)PRIMARY KEY,
    Gnum varchar(50)
);
CREATE TABLE Department(
    Dnum int PRIMARY KEY,
    Dname varchar(50)
);
CREATE TABLE User(
    Uaccount varchar(50)PRIMARY KEY,
    Unum varchar(50)NOT NULL,
    Uname varchar
 
(50)NOT NULL,
    U_identity_number varchar(50)NOT NULL,
    U_contact_number varchar(50)NOT NULL,
    Uaddress varchar(100) NOT NULL,
    Dnum int,
    FOREIGN KEY(Dnum)REFERENCES Department(Dnum)
);
CREATE TABLE Category(
    Cnum int PRIMARY KEY,
    Cname varchar(50)
);
CREATE TABLE Paper_infor(
    Pnum 
 
int PRIMARY KEY,
    Pname varchar(50)NOT NULL,
    Publishing varchar(100),
    Period int,
    Price int,
    PIntroduction varchar(200),
    Cnum int,
    FOREIGN KEY(Cnum)REFERENCES Category(Cnum)
);
CREATE TABLE Order_form(
    Onum int PRIMARY KEY,
    Uaccount varchar(50),
    Pnum int,
    Ocnt int
 
,
    Ostart varchar(100),
    Oend varchar(100),
    FOREIGN KEY(Uaccount)REFERENCES User(Uaccount),
    FOREIGN KEY(Pnum)REFERENCES Paper_infor(Pnum)
);
select *
FROM User;

insert into Administrator values('陶海雲','123456');
insert into Administrator values('陶寶','654321');

insert into Department values('人事部','1');
insert into Department values('運維部','2');
insert into Department values('開發部','3');
insert into Department values('產品部','4');

insert into User values('20162292','123123','陶一','3402211998','15526856768','安徽省','1');
insert into User values('20162200','321321','陶二','3402210921','15523213213','江蘇省','2');
insert into User values('20162233','111222','陶三','3402213213','18325387936','吉林省','3');
insert into User values('20162211','222111','陶四','2132132123','18209762703','上海市','4')

insert into Category values('1','時事政治');
insert into Category values('2','財政金融');
insert into Category values('3','科技數碼');
insert into Category values('4','人文風情');

insert into Paper_infor values('1','經濟日報','經濟出版社','12','10','分析時代經濟形勢','1');
insert into Paper_infor values('2','人民日報','人民教育出版社','6','10','簡述政治政策看點','2');
insert into Paper_infor values('3','IT時代報','科學出版社','24','15','分享科技前沿','3');
insert into Paper_infor values('4','中文新報','商務印書館','12','8','領略文學藝術','4');

insert into Order_form values('1','20162292','1','6','2018-3-1','2018-9-1');
insert into Order_form values('2','20162200','2','9','2018-4-29','2017-7-15');
insert into Order_form values('3','20162233','3','3','2018-6-23','2018-10-22');
insert into Order_form values('4','20162211','4','2','2017-5-1','2018-11-23');

select Uname
FROM User;

select *
FROM Paper_infor
WHERE Price='10';

select COUNT(*)
FROM User;

select Onum,Uaccount,Pnum,Ocnt
FROM Order_form
WHERE Ocnt 
BETWEEN 5 AND 10;

select Uaccount,Uname,Dnum
FROM User
WHERE Uname LIKE '陶%';

select Price,COUNT(*)
FROM Paper_infor
GROUP BY Price; 

select Order_form.Uaccount,User.Uname,Ocnt
FROM Order_form,User
WHERE Order_form.Uaccount=User.Uaccount;

create view v1
as
select Uaccount,Uname,Dnum
FROM User
WHERE Uname LIKE '陶%'; 

create trigger tri1 after insert
on Order_form for each row
updata Onum set Ocnt=Ocnt+1 where new.Onum=Order_form.Onum;