` create table stuInfo(
    stuInfoID number primary key,
    stuInfoName varchar2(32) not null,
    stuInfoSex varchar2(32) not null check(stuInfoSex in('男','女')),
    stuInfoBrithday date
    )
    /`

create table subInfo(
    subInfoID number primary key,
    subInfoName varchar2(32) not null
    )
    /

 create table scoreInfo(
    scoreInfoID number primary key,
     scoreInfo_stuInfoID number references stuInfo(stuInfoID),
    scoreInfo_subInfoID number references subInfo(subInfoID),
    score number check(score >= 0 and score <= 100)
    )
    /

//stuInfo表
insert into stuInfo values(1,'張三','男',to_date('1990-01-01','yyyy-MM-dd'));
insert into stuInfo values(2,'李四','男',to_date('1990-02-01','yyyy-MM-dd'));
insert into stuInfo values(3,'王五','女',to_date('1990-03-01','yyyy-MM-dd'));
insert into stuInfo values(4,'馬六','男',to_date('1990-04-01','yyyy-MM-dd'));
insert into stuInfo values(5,'劉七','女',to_date('1990-05-01','yyyy-MM-dd'));
insert into stuInfo values(6,'小明','男',to_date('2003-06-01','yyyy-MM-dd'));
insert into stuInfo values(7,'小紅','女',to_date('2002-07-01','yyyy-MM-dd'));
insert into stuInfo values(8,'小亮','男',to_date('2002-07-01','yyyy-MM-dd'));

select stuInfoID as 學號,stuInfoName as 姓名,stuInfoSex as 性別,stuInfoBrithday as 生日 from stuInfo;

//subInfo表
insert into subInfo values(1,'語文');
insert into subInfo values(2,'數(shù)學');
insert into subInfo values(3,'英語');
insert into subInfo values(4,'物理');
insert into subInfo values(5,'化學');
insert into subInfo values(6,'生物');
insert into subInfo values(7,'地理');
insert into subInfo values(8,'歷史');

select subInfoID as 編號,subInfoName as 課程名 from subInfo;

//score表
insert into scoreInfo values(1,1,1,95);
insert into scoreInfo values(2,2,2,97);
insert into scoreInfo values(3,3,3,100);
insert into scoreInfo values(4,4,4,86);
insert into scoreInfo values(5,5,5,89);
insert into scoreInfo values(6,6,6,91);
insert into scoreInfo values(7,7,7,93);
insert into scoreInfo values(8,8,8,90);

select scoreInfoId as 編號,scoreInfo_stuInfoID as 學號,scoreInfo_subInfoID as 課程號,score as 分數(shù) from scoreInfo;

create table stu1 as select stuInfoId,stuInfoName,stuInfoSex from stuInfo where stuInfoSex='女';

select stuInfoId as 學號,stuInfoName as 姓名,stuInfoSex as 性別 from stu1;

select stuInfoId as 學號,stuInfoName as 姓名,stuInfoSex as 性別 ,stuInfoBrithday as 生日 from stuInfo where stuInfoName like '張%';

select stuInfoId as 學號,stuInfoName as 姓名,stuInfoSex as 性別 ,stuInfoBrithday as 生日 from stuInfo where months_between(sysdate,stuInfoBrithday)/12>20;

select a .stuInfoID as 編號,a.stuInfoName as 姓名,a.stuInfoSex as 性別,a.stuInfoBrithday as 生日,b.score as 成績 from stuInfo a left join scoreInfo b on a.stuInfoID = b.scoreInfoID where a.stuInfoBrithday in (select stuInfoBrithday from stuInfo group by stuInfoBrithday having count(stuInfoBrithday)>1);

select c.scoreInfoID as 學生編號,a.stuInfoName as 學生姓名,b.subInfoName as 課程名稱 ,c.score as 課程成績 from stuInfo a,subInfo b,scoreInfo c where a.stuInfoID = c.scoreInfo_stuInfoID and b.subInfoID = c.scoreInfo_subInfoID order by c.score asc;

select stuInfoID as 學員學號,stuInfoName as 姓名 from stuInfo where stuInfoID = (select scoreInfo_stuInfoID from scoreInfo where score is null);