From af3b607e4086023eaaae004591ac2c1bbb82cf40 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=B1=BD=E5=A2=83?= <1537282342@qq.com>
Date: Sun, 5 Mar 2023 12:49:26 +0800
Subject: [PATCH 1/2] 1

---
 ...7\346\234\254\346\226\207\346\241\243.txt" | 138 ++++++++++++++++++
 1 file changed, 138 insertions(+)
 create mode 100644 "28 \351\273\204\346\242\223\345\242\203/20230305/\346\226\260\345\273\272\346\226\207\346\234\254\346\226\207\346\241\243.txt"

diff --git "a/28 \351\273\204\346\242\223\345\242\203/20230305/\346\226\260\345\273\272\346\226\207\346\234\254\346\226\207\346\241\243.txt" "b/28 \351\273\204\346\242\223\345\242\203/20230305/\346\226\260\345\273\272\346\226\207\346\234\254\346\226\207\346\241\243.txt"
new file mode 100644
index 0000000..4937b24
--- /dev/null
+++ "b/28 \351\273\204\346\242\223\345\242\203/20230305/\346\226\260\345\273\272\346\226\207\346\234\254\346\226\207\346\241\243.txt"	
@@ -0,0 +1,138 @@
+create database test charset utf8;
+use test;
+create table student(
+Sno varchar(20) primary key comment'学号',
+Sname varchar(20)not null comment'学生姓名',
+Ssex varchar(20)not null comment'学生性别',
+Sbirthday datetime comment'学生出生年月',
+Class varchar(20) comment'学生所在班级'
+);
+create table course(
+Cno varchar(20) primary key comment'课程号',
+Cname varchar(20)not null comment'课程名称',
+Tno varchar(20)not null comment'教工编号',
+foreign key (Tno) references Teacher(Tno)
+);
+create table score(
+Sno varchar(20)not null comment'学号',
+Cno varchar(20)not null comment'课程号',
+Degree decimal(4,1) comment'成绩',
+primary key (Sno,Cno),
+foreign key (Sno) references Student(Sno),
+foreign key (Cno) references Course(Cno)
+);
+create table teacher(
+Tno varchar(20)primary key comment'教工编号',
+Tname varchar(20)not null comment'教工姓名',
+Tsex varchar(20)not null comment'教工性别',
+Tbirthday datetime comment'教工出生年月',
+Prof varchar(20) comment'职称',
+Depart varchar(20)not null comment'教工所在部门'
+);
+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'),
+('3-245','操作系统','804'),
+('6-166','数字电路','856'),
+('9-888','高等数学','831');
+insert into score values
+('103','3-245','825'),
+('105','3-245','804'),
+('109','3-245','856'),
+('103','3-105','831'),
+('105','3-105','825'),
+('109','3-105','804'),
+('101','3-105','856'),
+('107','3-105','825'),
+('108','3-105','804'),
+('101','6-166','856'),
+('107','6-166','825'),
+('108','6-166','804');
+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','讲师','计算机系'),
+('831','刘冰','女','1977-8-14','讲师','电子工程系');
+-- 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 st.Sname,co.Cname from student st,course co,score sc where st.Sno=sc.Sno and co.Cno=sc.Cno;
+-- 2，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.Cno 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 ccac3487e0cab0ea219c8b4fbb98e61cde852c71 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E7=B1=BD=E5=A2=83?= <1537282342@qq.com>
Date: Tue, 7 Mar 2023 22:56:48 +0800
Subject: [PATCH 2/2] 1

---
 ...7\346\234\254\346\226\207\346\241\243.txt" | 92 +++++++++++++++++++
 1 file changed, 92 insertions(+)
 create mode 100644 "28 \351\273\204\346\242\223\345\242\203/20230306/\346\226\260\345\273\272\346\226\207\346\234\254\346\226\207\346\241\243.txt"

diff --git "a/28 \351\273\204\346\242\223\345\242\203/20230306/\346\226\260\345\273\272\346\226\207\346\234\254\346\226\207\346\241\243.txt" "b/28 \351\273\204\346\242\223\345\242\203/20230306/\346\226\260\345\273\272\346\226\207\346\234\254\346\226\207\346\241\243.txt"
new file mode 100644
index 0000000..90f23ad
--- /dev/null
+++ "b/28 \351\273\204\346\242\223\345\242\203/20230306/\346\226\260\345\273\272\346\226\207\346\234\254\346\226\207\346\241\243.txt"	
@@ -0,0 +1,92 @@
+create database class10 charset utf8;
+use class10;
+create table stuinfo(
+stuNO varchar(10),
+stuName varchar(16),
+stuSex varchar(2),
+stuAge varchar(2),
+stuAddress varchar(16),
+stuSeat varchar(1)
+);
+select * from stuinfo;
+
+insert into stuinfo VALUES
+('s2501','寮犵鍒�','鐢�',20,'缇庡浗纭呰胺',1),
+('s2502','鏉庢柉鏂�','濂�',18,'婀栧寳姝︽眽',2),
+('s2503','椹枃鎵�','鐢�',22,'婀栧寳闀挎矙',3),
+('s2504','娆ч槼淇婇泟','濂�',21,'婀栧寳姝︽眽',4),
+('s2505','姊呰秴椋�','鐢�',20,'婀栧寳姝︽眽',5),
+('s2506','闄堟棆椋�','鐢�',19,'缇庡浗纭呰胺',6);
+create table stuEam (
+examNO varchar(10),
+stuNO varchar(10),
+writtenExam varchar(4),
+labExam varchar(4)
+);
+insert into stuEam 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);
+create table stuMarks(
+examNo varchar(1),
+stuID varchar(10),
+score varchar(2)
+);
+insert into stuMarks VALUES
+(1,'s2501',88),
+(2,'s2502',92),
+(3,'s2503',53),
+(4,'s2504',60),
+(5,'s2505',99),
+(6,'s2506',82);
+select * from stuMarks;
+-- 鍦ㄥ鍥剧殑鏁版嵁琛ㄤ笂瀹屾垚浠ヤ笅棰樼洰
+-- 
+-- 1.鏌ヨ鍑哄勾榫勬瘮鐝笂骞冲潎骞撮緞澶х殑瀛︾敓鐨勪俊鎭�
+select * from stuinfo where stuAge > (select avg(stuAge) from stuinfo);
+-- 
+-- 2.鏌ヨ鍑烘瘡涓鐢熺殑瀛﹀彿锛屽鍚嶏紝鎬у埆鍜岄�変慨璇剧▼鐨勬渶楂樺垎锛坰tuMarks锛�
+select stuNO,stuName,stuSex,score from stuinfo info left join stuMarks mar on info.stuNO = mar.stuID;
+-- 
+-- 3.鏌ヨ鍑烘瘡涓鐢熺殑瀛﹀彿锛屽鍚嶏紝鎬у埆鍜岃�冭瘯骞冲潎鍒嗭紙stuExam锛�
+select info.stuNO,stuName,stuSex,(select (writtenExam + labExam)/2) from stuinfo info left JOIN stuEam Ex on info.stuNO = Ex.stuNO;
+-- 
+-- 4.鏌ヨ鎬у埆鏄敺骞朵笖骞撮緞澶т簬绛変簬20鐨勫鐢熺殑淇℃伅(鐢ㄤ袱绉嶆柟娉曞疄鐜帮細鏅�氭煡璇㈠拰瀛愭煡璇�)
+select * from stuinfo where stuSex = '鐢�' and stuAge >= 20;
+select * from (select * from stuinfo where stuSex = '鐢�' and stuAge >= 20) as biemin1;
+-- 5.鏌ヨ鍑哄勾榫勬瘮鎵�鏈夌敺鐢熷勾榫勯兘澶х殑濂崇敓鐨勪俊鎭�
+update stuinfo set stuAge = 25 where stuNO = 's2504';
+select * from stuinfo where stuAge > (select max(select stuAge from stuinfo where stuSex = '鐢�') as biemin2 from stuinfo) and stuSex = '濂�';-- 鏈夐棶棰�
+select * from stuinfo where stuAge > (select max(stuAge) from stuinfo where stuSex = '鐢�') and stuSex = '濂�';
+select * from stuinfo;
+
+-- 
+-- 6.鏌ヨ鍑烘墍鏈夐�変慨璇剧▼閮藉強鏍肩殑瀛︾敓鐨勪俊鎭�   锛坰tuMarks锛�
+select * from stuMarks where score >= 60;
+-- 
+-- 7.鏌ヨ鍑哄弬鍔犺�冭瘯鐨勫鐢熺殑淇℃伅锛堢敤琛ㄨ繛鎺ワ紝in浜岀鏂规硶鍋氾級锛坰tuMarks锛�
+-- 
+select * from 
+-- 8.鏌ヨ鍑烘病鏈夊弬鍔犺�冭瘯鐨勫鐢熺殑淇℃伅锛堢敤琛ㄨ繛鎺ワ紝in浜岀鏂规硶鍋氾級锛坰tuMarks锛�
+select *from
+-- 
+-- 9.灏嗘湁涓�闂ㄦ垚缁╂垚缁╁ぇ浜�90鍒嗙殑瀛︾敓鐨勫熀鏈俊鎭煡璇㈠嚭鏉ワ紙stuMarks锛�
+select * from stuinfo left join stuMarks on stuID=stuNO where score > 90;
+-- 
+-- 10.鏌ヨ鍑哄钩鍧囨垚缁╁湪80鍒嗕互涓婄殑瀛︾敓鐨勫熀鏈俊鎭紙stuMarks锛�
+-- 
+select * from stuinfo left join stuMarks on stuID = stuNO where (select avg())>80;
+-- 11.鏌ヨ鍑烘煇鍚屽鎵�鏈夎�冭瘯鎴愮哗姣斺�滃紶绉嬪埄鈥濆悓瀛︽墍鏈夊垎鏁伴兘楂樼殑瀛︾敓鍩烘湰淇℃伅锛坰tuMarks锛�
+select * from stuinfo having ()<(select )
+-- 
+-- 12.鏌ヨ鍑烘煇鍚屽鎵�鏈夎�冭瘯鎴愮哗鍙渶瑕佹瘮鈥滃紶绉嬪埄鈥濆悓瀛︽煇涓垎鏁伴珮鐨勫鐢熷熀鏈俊鎭紙stuMarks锛�
+select * from stuinfo left join stuMarks on stuID = stuNO where score > (select score from stuinfo left join stuMarks on stuID = stuNO where stuName = '寮犵鍒�')
+-- 
+-- 13.鏌ヨ鐝笂姣旀墍鏈夌敺鐢熷勾榫勯兘瑕佸ぇ鐨勫コ鐢熺殑淇℃伅
+select * from stuinfo where stuAge > (select max(stuAge) from stuinfo where stuSex = '鐢�') having stuSex = '濂�';
+-- 
+-- 14.鏌ヨ鍑哄彧鏄瘮鏌愪釜鐢风敓骞撮緞澶х殑濂崇敓鐨勪俊鎭�
+select 
\ No newline at end of file
-- 
Gitee