From 81f0bab9b5e5f815c05f05061bbfdda870aa2b2c Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?5=E5=8F=B7=E6=9E=97=E4=BC=9F=E5=BD=AC?= <2401916501@qq.com> Date: Fri, 24 Feb 2023 20:26:15 +0800 Subject: [PATCH 1/3] =?UTF-8?q?=E4=BF=AE=E6=94=B9=E4=BA=86=E7=AD=94?= =?UTF-8?q?=E6=A1=88?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- ...237\245\350\257\242_\350\277\220\347\256\227\347\254\246.md" | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git "a/05 \346\236\227\344\274\237\345\275\254/20230222 \345\237\272\347\241\200\346\237\245\350\257\242_\350\277\220\347\256\227\347\254\246.md" "b/05 \346\236\227\344\274\237\345\275\254/20230222 \345\237\272\347\241\200\346\237\245\350\257\242_\350\277\220\347\256\227\347\254\246.md" index d0f674f..204e396 100644 --- "a/05 \346\236\227\344\274\237\345\275\254/20230222 \345\237\272\347\241\200\346\237\245\350\257\242_\350\277\220\347\256\227\347\254\246.md" +++ "b/05 \346\236\227\344\274\237\345\275\254/20230222 \345\237\272\347\241\200\346\237\245\350\257\242_\350\277\220\347\256\227\347\254\246.md" @@ -323,7 +323,7 @@ SELECT *from employee ; select name from employee where name like '%小%'; ##要求5：**查询出薪资高于11000的男员工信息 -select *from employee WHERE salary>11000; +select *from employee WHERE salary>11000 and sex='男'; #要求6：**查询没有登记电话号码的员工 SELECT name from employee where tel is NULL; -- Gitee From ba196c10ccaba9bc636a1077c97b0ec9ca207fe7 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?5=E5=8F=B7=E6=9E=97=E4=BC=9F=E5=BD=AC?= <2401916501@qq.com> Date: Sun, 5 Mar 2023 13:30:32 +0800 Subject: [PATCH 2/3] =?UTF-8?q?=E6=9F=A5=E8=AF=A2=E4=BD=9C=E4=B8=9A?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../20230305 \346\237\245\350\257\242.md" | 186 ++++++++++++++++++ 1 file changed, 186 insertions(+) create mode 100644 "05 \346\236\227\344\274\237\345\275\254/20230305 \346\237\245\350\257\242.md" diff --git "a/05 \346\236\227\344\274\237\345\275\254/20230305 \346\237\245\350\257\242.md" "b/05 \346\236\227\344\274\237\345\275\254/20230305 \346\237\245\350\257\242.md" new file mode 100644 index 0000000..eaa2478 --- /dev/null +++ "b/05 \346\236\227\344\274\237\345\275\254/20230305 \346\237\245\350\257\242.md" @@ -0,0 +1,186 @@ +# 作业 + +```mysql +create database test06_user charset utf8; +use test06_user; +create table Student( + Sno varchar(20) not null primary key , + Sname varchar(20) not null, + Ssex varchar(20) not null, + Sbirthday datetime null , + Class varchar(20) null +); +create table Course( + Cno varchar (20) not null primary key, + Cname varchar(20) not null , + Tno varchar(20)not null + +); +alter table Course add constraint foreign key (Tno) references Teacher(Tno) on update cascade on delete cascade; +drop table Course; +create table Score( + Sno varchar(20) not null, + Cno varchar(20) not null, + Degree Decimal(4,1) null + +); +alter table Score add constraint foreign key(Sno) references Student(Sno)on update cascade on delete cascade; +alter table Score add constraint foreign key(Cno) references Course(Cno)on update cascade on delete cascade; +create table Teacher( + Tno varchar(20) not null primary key , + Tname varchar(20) not null , + Tsex varchar(20) not null, + Tbirthday datetime null , + Prof varchar(20) null, + 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'); + +insert into Course values('3-105','计算机导论','825'); +insert into Course values +('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; + + +-- 1,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 Student.Sno,Student.Sname,Student.Ssex,Cno 课程号,Degree 成绩 from Score +inner join Student on Score.Sno = Student.Sno; +-- 2，查询没有学生的教师的所有信息 +select *from Teacher +inner join course on Teacher.Tno = Course.Tno +left join Score S on Course.Cno = S.Cno +where S.Cno is null; + + +# ①　查询Score表中的最高分的学生学号和课程号。 +select Sno 学号,Cno 课程号 from Score having max(Degree); +# ②　查询所有学生的Sname、Cno和Degree列。 +select Sname,Cno,Degree from Score +inner join Student S on Score.Sno =S.Sno; +# ③　查询所有学生的Sno、Cname和Degree列。 +select Sno,Cname, Degree from Score S +inner join Course C on S.Cno = C.Cno; + +# ④　查询所有学生的Sname、Cname和Degree列。 +select Sname,Cname,Degree from Score S +inner join Student S2 on S.Sno = S2.Sno +inner join Course C on S.Cno = C.Cno; + +# ⑤　查询“95033”班学生的平均分。 +select Sname,round(avg(Degree),2) from Student S1, Score S2 +where S1.Sno = S2.Sno and Class='95033'; + +# ⑥　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 Cno='3-105' and +Degree > (select Degree from Score where Cno='3-105'and Sno='109'); + +# ⑦　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 max(Degree) from Score group by Cno; + +# ⑧　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'); + +# ⑨　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'; +# ⑩　查询“张旭“教师任课的学生成绩。 + +select Degree from Score S,Course C,Teacher T +where C.Cno=S.Cno and C.Tno=T.Tno and Tname='张旭'; + +# 11　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 C,Teacher T +where C.Tno=T.Tno + and Cno=(select Cno from score group by Cno having count(*)>5); + +# 12　查询出“计算机系“教师所教课程的成绩表。 +select S.* +from Score S,Teacher T ,Course C +where C.Tno=T.Tno and C.Cno=S.Cno and Depart='计算机系'; + +# 13　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 T 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'); +# 14　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; +# 15　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 Cno,Sno,Degree +from Score where Cno='3-105' and Degree>all +(select Degree from Score where Cno='3=245'); +# 16　查询成绩比该课程平均成绩低的同学的成绩表。 +select * +from score S +where S.Degree<(select avg(Degree) from Score SC where S.Cno=SC.Cno); +# 17　查询所有任课教师的Tname和Depart. +select Tname,Depart from Teacher; +# 18　查询所有未讲课的教师的Tname和Depart. +select Tname,Depart +from Teacher T +left join Course C on T.Tno = C.Tno +left join Score S on C.Cno = S.Cno +where S.Sno is null; +# 19　查询“男”教师及其所上的课程。 +select * +from Course C ,Teacher T +where C.Tno=T.Tno and Tsex='男'; +# 20　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); +# 21　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'); #但是查询出来连带李军也在内 +# 22　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'); +# 23　查询所有选修“计算机导论”课程的“男”同学的成绩表。 +select C.* +from Score S,Course C,Student St +where S.Cno=C.Cno and St.Sno=S.Sno and + Cname='计算机导论' and Ssex='男'; +``` + -- Gitee From 2f5b9c0b891a82f0b4108ac5362569b17cdec821 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?5=E5=8F=B7=E6=9E=97=E4=BC=9F=E5=BD=AC?= <2401916501@qq.com> Date: Tue, 7 Mar 2023 20:23:07 +0800 Subject: [PATCH 3/3] =?UTF-8?q?=E7=BB=83=E4=B9=A0=E9=A2=98=E4=BD=9C?= =?UTF-8?q?=E4=B8=9A?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- ...03\344\271\240\344\275\234\344\270\232.md" | 112 ++++++++++++++++++ 1 file changed, 112 insertions(+) create mode 100644 "05 \346\236\227\344\274\237\345\275\254/20230306 \347\273\203\344\271\240\344\275\234\344\270\232.md" diff --git "a/05 \346\236\227\344\274\237\345\275\254/20230306 \347\273\203\344\271\240\344\275\234\344\270\232.md" "b/05 \346\236\227\344\274\237\345\275\254/20230306 \347\273\203\344\271\240\344\275\234\344\270\232.md" new file mode 100644 index 0000000..945ea11 --- /dev/null +++ "b/05 \346\236\227\344\274\237\345\275\254/20230306 \347\273\203\344\271\240\344\275\234\344\270\232.md" @@ -0,0 +1,112 @@ +```mysql +CREATE DATABASE lianxi charset utf8; +use lianxi; +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, (select stuID from stumarks group by stuID having min(score)>=60) b where a.stuNO=b.stuID; + +# 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 *from stuinfo st ,(select stuID from stumarks group by stuID ) sk +where +st.stuNO =sk.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 st.* from stuinfo st,(select stuID from stumarks group by stuID having max(score)>90 ) sk +where +st.stuNO=sk.stuID; + +# 10.查询出平均成绩在80分以上的学生的基本信息（stuMarks） +select *from stuinfo st, (select stuID from stumarks group by stuID having avg(score)>80) +sk WHERE +st.stuNO=sk.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 st.*from stuinfo st, +(select stuID from stumarks where stuID !='s2501' group by stuID having max(score)> +(select max(score) form stumarks where stuID='s2501')) sk where +st.stuNO=sk.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 st.*from stuinfo st, +(select stuID from stumarks WHERE stuID !='s2501'group by stuID having max(score)> +(select min(score) from stumarks WHERE stuID='s2501' )) sk +where +st.stuNO=sk.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'); + + +``` + -- Gitee