From 6b5f7f67b34bc9b004eb947a7bd5220d74c6284f Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E8=B5=B5=E5=90=AF=E6=81=92?= <344887072@.com> Date: Sun, 5 Mar 2023 11:14:03 +0800 Subject: [PATCH 1/2] =?UTF-8?q?=E4=BD=9C=E4=B8=9A1?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../2023 3 5.txt" | 152 ++++++++++++++++++ 1 file changed, 152 insertions(+) create mode 100644 "36 \350\265\265\345\220\257\346\201\222/2023 3 5.txt" diff --git "a/36 \350\265\265\345\220\257\346\201\222/2023 3 5.txt" "b/36 \350\265\265\345\220\257\346\201\222/2023 3 5.txt" new file mode 100644 index 0000000..f22967b --- /dev/null +++ "b/36 \350\265\265\345\220\257\346\201\222/2023 3 5.txt" @@ -0,0 +1,152 @@ +```mysql +create database zy charset utf8; +use zy; +create table student( + Sno varchar(20) primary key, + Sname varchar(20) not null, + Ssex varchar(20) not null, + Sbirthday datetime, + Class varchar(20) +); +create table course( + Cno varchar(20) primary key, + Cname varchar(20) not null, + Tno varchar(20) not null +); +create table score( + Sno varchar (20) not null, + Cno varchar (20) not null, + Degree Decimal(4,1) not null, + primary key(Sno,Cno) +); + +create table teacher( + Tno varchar (20) primary key, + Tname varchar (20) not null , + Tsex varchar (20) not null , + Tbirthday datetime , + Prof varchar (20), + Depart varchar (20)not null +); + +insert into student values +(108,'曾华','男','1977-9-1','95033'), +(105,'匡明','男','1975-10-2','95031'), +(107,'王丽','女','1976-1-23','95033'), +(101,'李军','男','1976-2-20','95033'), +(109,'王芳','女','1975-2-10','95031'), +(103,'陆君','男','1974-6-3','95031'); +select * from student; + +insert into course values +('3-105','计算机导论',825), +('3-245','操作系统',804), +('6-166','数字电路',856), +('9-888','高等数学',831); +select * from course; + +insert into score values +('103','3-245',86), +('105','3-245',75), +('109','3-245',68), +('103','3-105',92), +('105','3-105',88), +('109','3-105',76), +('101','3-105',64), +('107','3-105',91), +('108','3-105',78), +('101','6-166',85), +('107','6-166',79), +('108','6-166',81); +select * from score; + +insert into teacher values +('804','李诚','男','1958-12-2','副教授','计算机系'), +('856','张旭','男','1969-3-12','讲师','电子工程系'), +('825','王萍','女','1972-5-5','助教','计算机系'), +('831','刘冰','女','1977-8-14','助教','电子工程系'); +select * from teacher; + +alter table course add foreign key (Tno) references teacher(Tno); +alter table score add foreign key (Sno) references student(Sno); +alter table score add foreign key (Cno) references course(Cno); +``` + + + +-- 查询所有学生，都学了哪些课程，要显示学生信息和课程信息/ +select st.Sname,co.Cname from student st,course co,score sc where st.Sno=sc.Sno and co.Cno=sc.Cno; + +-- 查询没有学生的教师的所有信息 +select * from teacher te left join course co on te.Tno = co.Tno left join score sc on co.Cno = sc.Cno where sc.Sno is null ; + +-- 查询Score表中的最高分的学生学号和课程号。 +select Sno,Cno from score where Degree=(select max(Degree) from score); + +-- 查询所有学生的Sname、Cno和Degree列。 +select st.Sname,sc.Cno,sc.Degree from student st ,score sc where st.sno=sc.sno; + +-- 查询所有学生的Sno、Cname和Degree列。 +select st.Sno,st.Sname,sc.Degree from student st ,score sc where st.sno=sc.sno; + +-- 查询所有学生的Sname、Cname和Degree列。 +select st.Sname,co.Cname,sc.Degree from student st ,course co ,score sc where st.sno=sc.sno and co.Cno=sc.Cno; + +-- 查询“95033”班学生的平均分。 +select avg(sc.Degree) from student st, score sc where st.Sno=sc.Sno and Class='95033'; + +-- 查询选修“3-105”课程的成绩高于“109”号同学成绩的所有同学的记录。 +select * from score where Degree>(select Degree from score where Sno='109'and Cno='3-105') and Cno='3-105'; + +-- 查询score中选学多门课程的同学中分数为非最高分成绩的记录。 +select * from score where Degree not in (select max(Degree) from score group by Cno); + +-- 查询成绩高于学号为“109”、课程号为“3-105”的成绩的所有记录。 +select * from score where Degree>(select Degree from score where Sno='109' and Cno='3-105'); + +-- 查询和学号为108的同学同年出生的所有学生的Sno、Sname和Sbirthday列。 +select Sno,Sname,Sbirthday from student where year(Sbirthday)=(select year(Sbirthday) from student where Sno='108') and Sno!='108'; + +-- 查询“张旭“教师任课的学生成绩。 +select Degree from teacher te,score sc,course co where te.Tno= co.Tno and co.Cno=sc.Cno and tname='张旭'; + +-- 查询选修某课程的同学人数多于5人的教师姓名。 +select tname from course co,teacher te where co.Tno=te.Tno and Cno=(select Cno from score group by Cno having count(*)>5); + +-- 查询出“计算机系“教师所教课程的成绩表。 +select sc.* from course co, score sc where co.Cno = sc.Cno and co.Tno in(select Tno from teacher where Depart='计算机系'); + +-- 查询“计算机系”与“电子工程系“不同职称的教师的Tname和Prof。 +select Tname,Prof from teacher where Prof not in (select Prof from teacher where Depart='计算机系') +union all +select Tname,Prof from teacher where Prof not in (select Prof from teacher where Depart='电子工程系'); + +-- 查询选修编号为“3-105“课程且成绩至少高于选修编号为“3-245”的同学的Cno、Sno和Degree,并按Degree从高到低次序排序。 +select Cno,Sno,Degree from score where Cno='3-105' and Degree>all(select Degree from score where Cno='3-245') order by Degree desc; + +-- 查询选修编号为“3-105”且成绩高于选修编号为“3-245”课程的同学的Cno、Sno和Degree. +select * from score where Cno='3-105' and Degree>all(select Degree from score where Cno='3-245'); + +-- 查询成绩比该课程平均成绩低的同学的成绩表。 +select * from score a where a.Degree<(select avg(Degree) from score b where a.Cno=b.Cno); + +-- 查询所有任课教师的Tname和Depart. +select Tname,Depart from teacher; + +-- 查询所有未讲课的教师的Tname和Depart. +select te.tname,te.Depart from teacher te left join course co on te.Tno = co.Tno left join score sc on co.Cno = sc.Cno where sc.Sno is null ; + +-- 查询“男”教师及其所上的课程。 +select * from teacher te,course co where te.tno=co.Tno and Tsex='男'; + +-- 查询最高分同学的Sno、Cno和Degree列。 +select sno,Cno,Degree from score where Cno in(select Cno from score group by Cno) and Degree in (select max(Degree) from score group by Cno); + +-- 查询和“李军”同性别的所有同学的Sname. +select Sname from student where Ssex=(select Ssex from student where Sname='李军'); + +-- 查询和“李军”同性别并同班的同学Sname. +select Sname from student where Ssex=(select Ssex from student where Sname='李军') and Class=(select class from student where Sname='李军'); + +-- 查询所有选修“计算机导论”课程的“男”同学的成绩表。 +select * from student st , score sc ,course co where st.Sno=sc.Sno and co.Cno=sc.Cno and st.Ssex='男' and co.Cname='计算机导论'; \ No newline at end of file -- Gitee From 86a6932c828f2085745353b9c635d2efc0449e92 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E8=B5=B5=E5=90=AF=E6=81=92?= <344887072@.com> Date: Tue, 7 Mar 2023 23:31:08 +0800 Subject: [PATCH 2/2] =?UTF-8?q?=E4=BD=9C=E4=B8=9A?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../2023 3 7.txt" | 102 ++++++++++++++++++ 1 file changed, 102 insertions(+) create mode 100644 "36 \350\265\265\345\220\257\346\201\222/2023 3 7.txt" diff --git "a/36 \350\265\265\345\220\257\346\201\222/2023 3 7.txt" "b/36 \350\265\265\345\220\257\346\201\222/2023 3 7.txt" new file mode 100644 index 0000000..8466852 --- /dev/null +++ "b/36 \350\265\265\345\220\257\346\201\222/2023 3 7.txt" @@ -0,0 +1,102 @@ +CREATE DATABASE text charset utf8; +use text; +CREATE table stuinfo( +stuNO VARCHAR(10) primary key, +stuName VARCHAR(10), +stuSex VARCHAR(10), +stuAge VARCHAR(10), +stuAddress VARCHAR(20), +stuSeat INT +); +CREATE table stuExam( +examNo int primary key auto_increment, +stuNO VARCHAR(10), +writtenExam int, +labExam INT +); +CREATE table stuMarks( +examNo int primary key auto_increment, +stuID VARCHAR(10), +score INT +); +alter table stuExam add foreign key (stuNO) references stuinfo(stuNO); +alter table stuMarks add foreign key (examNo) references stuExam(examNo); + + +INSERT into stuinfo VALUES +('s2501','张秋利','男',20,'美国硅谷',1), +('s2502','李斯文','女',18,'湖北武汉',2), +('s2503','马文才','男',18,'湖南长沙',3), +('s2504','欧阳俊雄','女',21,'湖北武汉',4), +('s2505','梅超风','男',20,'湖北武汉',5), +('s2506','陈旋风','男',19,'美国硅谷',6); + +INSERT INTO stuExam VALUES +(1,'s2501',50,70), +(2,'s2502',60,65), +(3,'s2503',86,70), +(4,'s2504',40,80), +(5,'s2505',70,85), +(6,'s2506',85,90); + +INSERT into stuMarks VALUES +(1,'s2501',88), +(2,'s2501',92), +(3,'s2501',53), +(4,'s2502',60), +(5,'s2502',99), +(6,'s2503',82); + + +# 1.查询出年龄比班上平均年龄大的学生的信息 +select * from stuinfo where stuAge>(select avg(stuAge) from stuinfo); + +# 2.查询出每个学生的学号，姓名，性别和选修课程的最高分（stuMarks） +select a.stuNO,a.stuName,a.stuSex,max(score) from stuinfo a left join stumarks b on a.stuNO=b.stuID group by stuNO; + +# 3.查询出每个学生的学号，姓名，性别和考试平均分（stuExam） +select a.stuNO,a.stuName,a.stuSex,(b.writtenExam+b.labExam)/2 平均分 from stuinfo a left join stuexam b on a.stuNO=b.stuNO; + +# 4.查询性别是男并且年龄大于等于20的学生的信息(用两种方法实现：普通查询和子查询) +select * from stuinfo where stuSex='男' and stuAge>=20; + +# 5.查询出年龄比所有男生年龄都大的女生的信息 +select * from stuinfo where stuSex='女' and stuAge>(select max(stuAge) from stuinfo where stuSex='男'); + +# 6.查询出所有选修课程都及格的学生的信息 （stuMarks） +select a.* from stuinfo a, stumarks b where a.stuNO=b.stuID group by stuID having min(b.score)>=60; + +# 7.查询出参加考试的学生的信息（用表连接，in二种方法做）（stuMarks） +select a.* from stuinfo a,(select stuID from stumarks group by stuID) b where a.stuNO=b.stuID; + +# 8.查询出没有参加考试的学生的信息（用表连接，in二种方法做）（stuMarks） +select * from stuinfo where stuNO not in(select stuID from stumarks group by stuID); + +# 9.将有一门成绩成绩大于90分的学生的基本信息查询出来（stuMarks） +select a.* from stuinfo a,(select stuID from stumarks group by stuID having max(score)>90) b where a.stuNO=b.stuID; + +# 10.查询出平均成绩在80分以上的学生的基本信息（stuMarks） +select a.* from stuinfo a,(select stuID from stumarks group by stuID having avg(score)>80) b where a.stuNO=b.stuID; + +# 11.查询出某同学所有考试成绩比“张秋利”同学所有分数都高的学生基本信息（stuMarks） +select a.* from +stuinfo a, +(select stuID from stumarks where stuID!='s2501' group by stuID having max(score)>(select max(score) from stumarks where stuID='s2501')) b +where + a.stuNO=b.stuID; + +# 12.查询出某同学所有考试成绩只需要比“张秋利”同学某个分数高的学生基本信息（stuMarks） +select a.* from +stuinfo a, +(select stuID from stumarks where stuID!='s2501' group by stuID having max(score)>(select min(score) from stumarks where stuID='s2501')) b +where + a.stuNO=b.stuID; + +# 13.查询班上比所有男生年龄都要大的女生的信息 +select * from stuinfo where stuSex='女' and stuAge>(select max(stuAge) from stuinfo where stuSex='男'); + +# 14.查询出只是比某个男生年龄大的女生的信息 +select * from stuinfo where stuSex='女' and stuAge>(select min(stuAge) from stuinfo where stuSex='男'); + + +``` \ No newline at end of file -- Gitee