day23-24mysql数据库基础

Day23-24(MySQL数据库基础)/day24作业/作业1.txt

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+һ��������
+1.student��
+sno,ѧ��
+sname������
+sex���Ա�
+dept��ϵ��
+birth������
+age������
+phoen���绰
+
+
+2.course��
+cno���γ̱��
+cname�������
+credit��ѧ��
+
+3.csѡ�α�
+sno��ѧ��
+cno���γ̱��
+cj���ɼ�
+
+������������
+
+������ѯ
+1.--��ѯ�����Ŀ��Գɼ�
+select cno,cj from cs where sno=(select sno  from student where sname='����
+');
+2.--��ѯ������ͬѧ�Ŀ��Գɼ�
+select * from cs where sno in (select sno from student where sex='��');
+
+3.--��ѯ���з�ѧ�ο��Գɼ�
+select * from cs where cno=(select cno from course where cname='��ѧ')
+
+4.--��ѯѡ��java�γ̵�ѧ������
+select sname from student where sno in (select sno from cs where cno=(select cno from course where cname='JAVA'))
+
+5.--��ѯ����80�ֵ�����ͬѧ��������ϵ��
+select sname,sdept from student where sno in (select sno from cs where
+ cj<80);
+
+6.--��ѯѡ��2�ſγ̲��ҿ��Գɼ���90�����ϵ�ѧ��������ѧ��
+select sname,sno from student where sno in (select sno from cs where 
+cno = 2 and cj > 90);
+
+7.--��ѯ��'����'��ͬһϵ��ͬѧ��Ϣ
+select * from student where sdept=(select sdept from student where 
+sname ='����');
+
+8.--��ѯ����ϵ�бȼ����ϵ����һ��ѧ��������С��ѧ����Ϣ
+select * from student where sno in (select sno from student where sdept <>
+'�����ϵ' and sage < ALL  (select sage from student 
+where sdept = '�����ϵ'));
+
+9.--��ѯ��Ϣϵ�б�ƽ������͵�����ѧ����Ϣ
+select * from student where sdept ='��Ϣϵ' and 
+sage < (select avg(sage) from student);
+
+10.--��ѯû��ѡ��3�ſγ̵�����ѧ��
+select *��from student where sno not in (select sno from cs where cno = 3); 
+
+
+
+
+�𰸣�
+1.������
+��һ��student��ѧ����
+CREATE TABLE student(--student
+ sno NUMBER(4) PRIMARY KEY,--ѧ�����
+ sname VARCHAR(20) NOT NULL,--ѧ������
+ sex VARCHAR(4) CONSTRAINT SEX CHECK (SEX='��' or sex='Ů'),--ѧ���Ա�
+ dept varchar(20) CONSTRAINT  DEPT CHECK(DEPT IN ('��Ϣϵ','�������ѧϵ','��ѧϵ','����ϵ','����ϵ','����ϵ','��ѧϵ')),--ϵ��
+ brith date ,--����
+ age number(2) CONSTRAINT AGE CHECK (AGE BETWEEN 1 AND 100),--����
+ phone NUMBER(11)
+)
+������course���γ̱�
+CREATE TABLE  COURSE (--course
+ cno NUMBER(4) PRIMARY KEY,--�γ̱��
+ cname VARCHAR(20) NOT NULL,--�����
+ credit NUMBER(2)--ѧ��
+ credit
+)
+������cs��ѡ�α�
+
+
+2.��������
+
+INSERT INTO STUDENT VALUES (001,'����','��','��Ϣϵ','1-3��-1990',20,'13823451234');
+insert into STUDENT values(002,'����','��','��ѧϵ','15-7��-1994',23,13171254631);
+insert into STUDENT values(003,'����','Ů','����ϵ','3-9��-1995',22,15815674123);
+insert into STUDENT values(004,'����','��','����ϵ','22-2��-1997',20,13214567125);
+insert into STUDENT values(005,'����','��','��ѧϵ','26-8��-1995',22,15012387953);
+insert into STUDENT values(006,'����','Ů','�������ѧϵ','26-8��-1995',22,15012567953);
+insert into STUDENT values(007,'����','��','�������ѧϵ','26-8��-1995',18,15012567900);
+
+
+INSERT INTO COURSE VALUES(001,'��ѧ',4);
+INSERT INTO COURSE VALUES(002,'Ӣ��',2);
+INSERT INTO COURSE VALUES(003,'JAVA',3);
+INSERT INTO COURSE VALUES(004,'����ѧ',3);
+INSERT INTO COURSE VALUES(005,'��ѧ',3);
+INSERT INTO COURSE VALUES(006,'SQL',3);
+
+
+INSERT INTO CS VALUES(1,3,87);
+INSERT INTO CS VALUES(2,4,67);
+INSERT INTO CS VALUES(5,1,66);
+INSERT INTO CS VALUES(4,2,95);
+INSERT INTO CS VALUES(3,3,58);
+INSERT INTO CS VALUES(4,5,90);
+INSERT INTO CS VALUES(1,2,90);
+
+
+

Day23-24(MySQL数据库基础)/day24作业/作业2.txt

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+--6.��ѯ���Ų���ACCOUNTING��SALES
+--7.��ѯ���ʱ�20�Ų�������һ��Ա�����ߵ�Ա����Ϣ
+--8.��ѯ���ʱ�20�Ų�������Ա�����ߵ�Ա����Ϣ
+--9.��ѯ�����쵼��Ա�� ��Ϣ
+--10.�ҵ�Ա������нˮ���ڱ�����ƽ��нˮ��Ա����