From b5a389d114da3ffdcb4137ebe669fdb63485c991 Mon Sep 17 00:00:00 2001 From: gaoyi1234567 <3014588127@qq.com> Date: Tue, 6 Apr 2021 13:58:43 +0800 Subject: [PATCH] 1 --- .../\351\253\230\345\245\225/SQLQuery1.sql" | 177 ++++++ .../\351\253\230\345\245\225/SQLQuery2.sql" | 107 ++++ .../\351\253\230\345\245\225/SQLQuery3.sql" | 64 +++ .../\351\253\230\345\245\225/stdent.sql" | 531 ++++++++++++++++++ 4 files changed, 879 insertions(+) create mode 100644 "2021 04 02 \344\275\234\344\270\232/\351\253\230\345\245\225/SQLQuery1.sql" create mode 100644 "2021 04 02 \344\275\234\344\270\232/\351\253\230\345\245\225/SQLQuery2.sql" create mode 100644 "2021 04 02 \344\275\234\344\270\232/\351\253\230\345\245\225/SQLQuery3.sql" create mode 100644 "2021 04 02 \344\275\234\344\270\232/\351\253\230\345\245\225/stdent.sql" diff --git "a/2021 04 02 \344\275\234\344\270\232/\351\253\230\345\245\225/SQLQuery1.sql" "b/2021 04 02 \344\275\234\344\270\232/\351\253\230\345\245\225/SQLQuery1.sql" new file mode 100644 index 0000000..f5dda3a --- /dev/null +++ "b/2021 04 02 \344\275\234\344\270\232/\351\253\230\345\245\225/SQLQuery1.sql" @@ -0,0 +1,177 @@ +create database GoodsDB +on +( + name='GoodsDB', + filename='D:\GoodsDB.mdf', + size=5mb, + maxsize=50mb, + filegrowth=10% +) +log on +( + name='GoodsDB_log', + filename='D:\GoodsDB_log.ldf', + size=5mb, + maxsize=50mb, + filegrowth=10% +) +go + +use GoodsDB +go + +create table GoodsType +( + TypeID int primary key identity(1,1) not null, + TypeName nvarchar(20) not null +) +go + +create table GoodsInfo +( + GoodsID int primary key identity(1,1), + GoodsName nvarchar(20) not null, + GoodsColor nvarchar(20) not null, + GoodsBrand nvarchar(20), + GoodsMoney money not null, + TypeID int references GoodsType(TypeID) +) +go + +insert into GoodsType values ('服装内衣'), +('鞋包配饰'), +('手机数码') + +select * from GoodsType + +insert into GoodsInfo values +('提花小西装','红色','费曼琪',300,1), +('百搭短裤','绿色','哥弟',100,1), +('无袖背心','白色','阿依莲',700,1), +('低帮休闲鞋','红色','费曼琪',900,2), +('中跟单鞋','绿色','哥弟',400,2), +('平底鞋','白色','阿依莲',200,2), +('迷你照相机','红色','尼康',500,3), +('硬盘','黑色','希捷',600,3) +go + + +select * from GoodsInfo + + +--3、查询价格最贵的商品名称，商品颜色和商品价格，要求使用别名显示列名 +select GoodsName 商品名称,GoodsColor 商品颜色, GoodsMoney 价格 from GoodsInfo where GoodsMoney=(select max(GoodsMoney) from GoodsInfo) group by GoodsID,GoodsColor,GoodsName,GoodsMoney +select max(GoodsMoney) from GoodsInfo + + +--4、按商品类型编号分组查询商品最高价格，最低价格和平均价格，要求使用别名显示列名 +select max(GoodsMoney)最高价格,min(GoodsMoney)最低价格,avg(GoodsMoney)平均价格 from GoodsInfo group by TypeID + +--5、查询商品信息所有列，要求商品颜色为红色，价格在300~600之间 + +select * from GoodsInfo where GoodsColor='红色' and GoodsMoney between 300 and 600 + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + diff --git "a/2021 04 02 \344\275\234\344\270\232/\351\253\230\345\245\225/SQLQuery2.sql" "b/2021 04 02 \344\275\234\344\270\232/\351\253\230\345\245\225/SQLQuery2.sql" new file mode 100644 index 0000000..6787e92 --- /dev/null +++ "b/2021 04 02 \344\275\234\344\270\232/\351\253\230\345\245\225/SQLQuery2.sql" @@ -0,0 +1,107 @@ +create database HOUSE_DB +on +( + name=house, + filename='E:\Demo\house.mdf', + size=5mb, + maxsize=50mb, + filegrowth=1mb +) +log on +( + name=house_log, + filename='E:\Demo\house_log.ldf', + size=5mb, + maxsize=50mb, + filegrowth=1mb +) +go + +use HOUSE_DB +go + +create table HOUSE_TYPE +( + type_id int primary key identity(1,1) not null, + type_name varchar(50) unique not null +) +go + +create table HOUSE +( + house_id int primary key identity(1,1), + house_name varchar(50) not null, + house_price float default(0) not null, + type_id int references HOUSE_TYPE(type_id) not null +) +go + + +insert into HOUSE_TYPE values ('小户型'), +('经济型'), +('别墅') + + +insert into HOUSE (house_name,house_price,type_id) values ('大平层海景型别墅',5000,3), +('精装三户',2500,1), +('简易三户',2000,2), +('独栋海景',5000,3) + + + +--查询所有房屋信息 +select * from HOUSE full join HOUSE_TYPE on HOUSE.type_id=HOUSE_TYPE.type_id + +--使用模糊查询包含”型“字的房屋类型信息 +select * from HOUSE full join HOUSE_TYPE on HOUSE.type_id=HOUSE_TYPE.type_id +where house_name like '%型%' + +--查询出房屋的名称和租金，并且按照租金降序排序 +select house_name,house_price from HOUSE order by house_price DESC + +--使用连接查询，查询信息，显示房屋名称和房屋类型名称 +select HOUSE_TYPE.type_name,HOUSE.house_name from HOUSE +inner join HOUSE_TYPE on HOUSE_TYPE.type_id=HOUSE.type_id + + +--查询所有房屋中月租最高的房屋，显示最高的租金和房屋名称 +select max(house_price) from HOUSE + +select top 1 house_name,house_price from HOUSE +where house_price=(select max(house_price) from HOUSE ) + +select top 1 house_name,house_price from HOUSE +order by house_price DESC + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + diff --git "a/2021 04 02 \344\275\234\344\270\232/\351\253\230\345\245\225/SQLQuery3.sql" "b/2021 04 02 \344\275\234\344\270\232/\351\253\230\345\245\225/SQLQuery3.sql" new file mode 100644 index 0000000..4251c93 --- /dev/null +++ "b/2021 04 02 \344\275\234\344\270\232/\351\253\230\345\245\225/SQLQuery3.sql" @@ -0,0 +1,64 @@ +create database StarManagerDB +on +( + name=house, + filename='E:\Demo\StarManagerDB.mdf', + size=5mb, + maxsize=50mb, + filegrowth=1mb +) +log on +( + name=house_log, + filename='E:\Demo\StarManagerDB_log.ldf', + size=5mb, + maxsize=50mb, + filegrowth=1mb +) +go + +create table StarType +( + T_NO int primary key identity(1,1), + T_NAME nvarchar(20) +) +go + +create table StarInfo +( + S_NO int primary key identity(1,1), + S_NAME nvarchar(20), + S_AGE int, + S_HOBBY nvarchar(20), + S_NATIVE nvarchar(20), + S_T_NO int references StarType(T_NO) +) +go + + +insert into StarType values ('体育明星'), +('IT明星'), +('相声演员') + +select * from StarType + + +insert into StarInfo (S_NAME,S_AGE,S_HOBBY,S_NATIVE,S_T_NO) values ('梅西',30,'射门','阿根廷',1), +('科比',35,'过人','美国',1), +('蔡景现',40,'敲代码','中国',2), +('马斯克',36,'造火箭','外星人',2), +('郭德纲',50,'相声','中国',3), +('黄铮',41,'拼多多','中国',2) + +--3、查询年龄最大的3个明星的姓名，特技和籍贯信息，要求使用别名显示列名。 +select top 3 S_NAME 姓名,S_HOBBY 特技,S_NATIVE 籍贯 from StarInfo +order by S_AGE DESC + +--4、按明星类型编号分类查询明星人数，明星平均年龄，显示明星人数大于2的分组信息，要求使用别名显示列名。 +select S_T_NO 明星类型,count(S_T_NO)明星人数,avg(S_AGE)平均年龄 from StarInfo +group by S_T_NO having count(S_T_NO)>2 + + +--5、查询明星类型为“体育明星”中年龄最大的姓名、特技、籍贯信息，要求显示列别名。 +select top 1 S_NAME 姓名,S_HOBBY 特技,S_NATIVE 籍贯 from StarInfo where S_T_NO=1 order by S_AGE DESC + diff --git "a/2021 04 02 \344\275\234\344\270\232/\351\253\230\345\245\225/stdent.sql" "b/2021 04 02 \344\275\234\344\270\232/\351\253\230\345\245\225/stdent.sql" new file mode 100644 index 0000000..8aef83a --- /dev/null +++ "b/2021 04 02 \344\275\234\344\270\232/\351\253\230\345\245\225/stdent.sql" @@ -0,0 +1,531 @@ +create database ClassicDb + +GO + + + +use ClassicDb + +GO + + + +create table StudentInfo + +( + + Id int PRIMARY key not null IDENTITY, + + StudentCode nvarchar(80), + + StudentName nvarchar(80), + + Birthday date not null, + + Sex nvarchar(2), + + ClassId int not null + +) + + + +GO + + + +-- select * from StudentInfo + + + +insert into StudentInfo (StudentCode,StudentName,Birthday,Sex,ClassId) values('01' , '赵雷' , '1990-01-01' , 'm',1) + +insert into StudentInfo (StudentCode,StudentName,Birthday,Sex,ClassId) values('02' , '钱电' , '1990-12-21' , 'm',1) + +insert into StudentInfo (StudentCode,StudentName,Birthday,Sex,ClassId) values('03' , '孙风' , '1990-12-20' , 'm',1) + +insert into StudentInfo (StudentCode,StudentName,Birthday,Sex,ClassId) values('04' , '李云' , '1990-12-06' , 'm',1) + +insert into StudentInfo (StudentCode,StudentName,Birthday,Sex,ClassId) values('05' , '周梅' , '1991-12-01' , 'f',1) + +insert into StudentInfo (StudentCode,StudentName,Birthday,Sex,ClassId) values('06' , '吴兰' , '1992-01-01' , 'f',1) + +insert into StudentInfo (StudentCode,StudentName,Birthday,Sex,ClassId) values('07' , '郑竹' , '1989-01-01' , 'f',1) + +insert into StudentInfo (StudentCode,StudentName,Birthday,Sex,ClassId) values('09' , '张三' , '2017-12-20' , 'f',1) + +insert into StudentInfo (StudentCode,StudentName,Birthday,Sex,ClassId) values('10' , '李四' , '2017-12-25' , 'f',1) + +insert into StudentInfo (StudentCode,StudentName,Birthday,Sex,ClassId) values('11' , '李四' , '2012-06-06' , 'f',1) + +insert into StudentInfo (StudentCode,StudentName,Birthday,Sex,ClassId) values('12' , '赵六' , '2013-06-13' , 'f',1) + +insert into StudentInfo (StudentCode,StudentName,Birthday,Sex,ClassId) values('13' , '孙七' , '2014-06-01' , 'f',1) + + + + + +GO + + + + + +CREATE TABLE Teachers + +( + + Id int PRIMARY key not null IDENTITY, + + TeacherName nvarchar(80) + +) + + + +go + +-- select * from Teachers + + + +insert into Teachers (TeacherName) values('张三') + +insert into Teachers (TeacherName) values('李四') + +insert into Teachers (TeacherName) values('王五') + + + +GO + + + +create table CourseInfo + +( + + Id int PRIMARY key not null IDENTITY, + + CourseName NVARCHAR(80) not null, + + TeacherId int not null + +) + + + +go + +-- select * from CourseInfo + + + +insert into CourseInfo (CourseName,TeacherId) values( '语文' , 2) + +insert into CourseInfo (CourseName,TeacherId) values( '数学' , 1) + +insert into CourseInfo (CourseName,TeacherId) values( '英语' , 3) + + + +GO + + + +create table StudentCourseScore + +( + + Id int PRIMARY key not null IDENTITY, + + StudentId int not null, + + CourseId int not null, + + Score int not null + +) + +go + +-- select * from StudentCourseScore + + + +insert into StudentCourseScore (StudentId,CourseId,Score) values((select Id from StudentInfo where StudentCode='01') , 1 , 80) + +insert into StudentCourseScore (StudentId,CourseId,Score) values((select Id from StudentInfo where StudentCode='01') , 2 , 90) + +insert into StudentCourseScore (StudentId,CourseId,Score) values((select Id from StudentInfo where StudentCode='01') , 3 , 99) + +insert into StudentCourseScore (StudentId,CourseId,Score) values((select Id from StudentInfo where StudentCode='02') , 1 , 70) + +insert into StudentCourseScore (StudentId,CourseId,Score) values((select Id from StudentInfo where StudentCode='02') , 2 , 60) + +insert into StudentCourseScore (StudentId,CourseId,Score) values((select Id from StudentInfo where StudentCode='02') , 3 , 80) + +insert into StudentCourseScore (StudentId,CourseId,Score) values((select Id from StudentInfo where StudentCode='03') , 1 , 80) + +insert into StudentCourseScore (StudentId,CourseId,Score) values((select Id from StudentInfo where StudentCode='03') , 2 , 80) + +insert into StudentCourseScore (StudentId,CourseId,Score) values((select Id from StudentInfo where StudentCode='03') , 3 , 80) + +insert into StudentCourseScore (StudentId,CourseId,Score) values((select Id from StudentInfo where StudentCode='04') , 1 , 50) + +insert into StudentCourseScore (StudentId,CourseId,Score) values((select Id from StudentInfo where StudentCode='04') , 2 , 30) + +insert into StudentCourseScore (StudentId,CourseId,Score) values((select Id from StudentInfo where StudentCode='04') , 3 , 20) + +insert into StudentCourseScore (StudentId,CourseId,Score) values((select Id from StudentInfo where StudentCode='05') , 1 , 76) + +insert into StudentCourseScore (StudentId,CourseId,Score) values((select Id from StudentInfo where StudentCode='05') , 2 , 87) + +insert into StudentCourseScore (StudentId,CourseId,Score) values((select Id from StudentInfo where StudentCode='06') , 1 , 31) + +insert into StudentCourseScore (StudentId,CourseId,Score) values((select Id from StudentInfo where StudentCode='06') , 3 , 34) + +insert into StudentCourseScore (StudentId,CourseId,Score) values((select Id from StudentInfo where StudentCode='07') , 2 , 89) + +insert into StudentCourseScore (StudentId,CourseId,Score) values((select Id from StudentInfo where StudentCode='07') , 3 , 98) + + + +go + +select * from StudentCourseScore +select * from StudentInfo +select * from CourseInfo +select * from Teachers + +-- 1.查询"数学 "课程比" 语文 "课程成绩高的 学生的信息 及课程分数 + +--select AA.*,SI.StudentName from (select yu.StudentId,yu.CourseId yuCourseId,yu.Score yuScore,shu.CourseId shuCourseId,shu.Score shuScore +--from (SELECT * FROM StudentCourseScore SC WHERE SC.CourseId=1) AS yu, +--(SELECT * FROM StudentCourseScore SC WHERE SC.CourseId=2) AS shu +--WHERE shu.Score > yu.Score AND yu.StudentId = shu.StudentId) AA +--inner join StudentInfo SI ON SI.Id=AA.StudentId + +--select * from (SELECT * FROM StudentCourseScore SC WHERE SC.CourseId=1) AS yu, +--(SELECT * FROM StudentCourseScore SC WHERE SC.CourseId=2) AS shu +--WHERE shu.Score > yu.Score AND yu.StudentId = shu.StudentId + + +SELECT * FROM StudentCourseScore A,StudentCourseScore B +where A.StudentId=B.StudentId AND A.CourseId=2 AND B.CourseId=1 AND A.Score>B.Score + +-- 1.1 查询同时存在" 数学 "2课程和" 语文 "1课程的情况 +select StudentId,count(CourseId) from StudentCourseScore +where CourseId = 1 or CourseId =2 +group by StudentId +having count(CourseId)=2 +-- 1.2 查询存在" 数学 "课程但可能不存在" 语文 "课程的情况(不存在时显示为 null ) +select * from +(select * from StudentCourseScore where CourseId =2)as A +left join(select * from StudentCourseScore where CourseId =1) as B on A.StudentId= B.StudentId + + +-- 1.3 查询不存在" 数学 "课程但存在" 语文 "课程的情况 +select * from +(select * from StudentCourseScore where CourseId =1)as A +left join(select * from StudentCourseScore where CourseId =2) as B on A.StudentId= B.StudentId + + +-- 2.查询 平均成绩大于等于 60 分 的同学的 学生编号和 学生姓名和 平均成绩 +select StudentId,StudentName,AVG(Score)平均成绩 from StudentCourseScore +inner join StudentInfo on StudentInfo.StudentCode=StudentCourseScore.StudentId +group by StudentId,StudentName having AVG(Score)>=60 + + +-- 3.查询在 成绩 表存在成绩的学生信息 +select * from StudentInfo +right join StudentCourseScore on StudentCourseScore.StudentId=StudentInfo.StudentCode + + +-- 4.查询所有同学的学生编号、学生姓名、选课总数、所有课程的总成绩(没成绩的显示为 null ) +select StudentInfo.Id 学生编号,StudentName 学生姓名,count(StudentId)选课总数,sum(Score)所有课程的总成绩 from StudentInfo +left join StudentCourseScore on StudentInfo.StudentCode= StudentCourseScore.StudentId +group by StudentInfo.Id,StudentName order by StudentInfo.Id + +-- 4.1 查有成绩的学生信息 +select * from StudentInfo inner join StudentCourseScore on StudentCourseScore.StudentId=StudentInfo.StudentCode + + +-- 5.查询「李」姓老师的数量 +select * from Teachers where TeacherName like '李%' + + +-- 6.查询学过「张三」老师授课的同学的信息 +select * from StudentInfo +inner join StudentCourseScore on StudentCourseScore.StudentId=StudentInfo.StudentCode +where StudentCourseScore.CourseId=2 + + +-- 7.查询没有学全所有课程的同学的信息 +select StudentId,StudentName,Birthday,Sex,ClassId from StudentCourseScore +inner join StudentInfo on StudentInfo.StudentCode=StudentCourseScore.StudentId +group by StudentId,StudentName,Birthday,Sex,ClassId having count(StudentId)<3 + +-- 8.查询至少有一门课与学号为" 01 "的同学所学相同的同学的信息 +select distinct StudentId,StudentName from StudentCourseScore +inner join StudentInfo on StudentCourseScore.StudentId=StudentInfo.StudentCode +where CourseId=1 or CourseId=2 or CourseId=3 + +-- 9.查询和" 01 "号的同学学习的课程 完全相同的其他同学的信息 +select StudentId from StudentCourseScore group by StudentId having count(StudentId)=3 + + +-- 10.查询没学过"张三"老师讲授的任一门课程的学生姓名 +select * from StudentCourseScore +right join StudentInfo on StudentInfo.StudentCode=StudentCourseScore.StudentId + +-- 11.查询两门及其以上不及格课程的同学的学号，姓名及其平均成绩 + +select StudentId,StudentName,avg(Score)平均成绩 from StudentCourseScore sc +inner join StudentInfo B on sc.StudentId = B.StudentCode +Where (Select Count(*) From StudentCourseScore s1 Where s1.StudentId=sc.StudentId And Score<60)>=2 +Group By StudentId ,StudentName + +-- 12.检索" 数学 "课程分数小于 60，按分数降序排列的学生信息 +select StudentId,Score from StudentCourseScore +where StudentId=(select * from StudentCourseScore where CourseId=2 and Score<60) + + + +-- 13.按平均成绩从高到低显示所有学生的所有课程的成绩以及平均成绩 +select StudentId 学生号,sum(Score)总成绩,avg(Score)平均成绩 from StudentCourseScore group by StudentId order by avg(Score) DESC + + +-- 14.查询各科成绩最高分、最低分和平均分： +select max(Score)最高分,min(Score)最低分,avg(Score)平均分 from StudentCourseScore group by CourseId + + +-- 15.以如下形式显示：课程 ID，课程 name，最高分，最低分，平均分，及格率，中等率，优良率，优秀率 + +/* + + 及格为>=60，中等为：70-80，优良为：80-90，优秀为：>=90 + + + + 要求输出课程号和选修人数，查询结果按人数降序排列，若人数相同，按课程号升序排列 + + + + 按各科成绩进行排序，并显示排名， Score 重复时保留名次空缺 + +*/ + + + +-- 15.1 按各科成绩进行排序，并显示排名， Score 重复时合并名次 + + + +-- 16.查询学生的总成绩，并进行排名，总分重复时保留名次空缺 + + + +-- 16.1 查询学生的总成绩，并进行排名，总分重复时不保留名次空缺 + + + +-- 17.统计各科成绩各分数段人数：课程编号，课程名称，[100-85]，[85-70]，[70-60]，[60-0] 及所占百分比 + + + +-- 18.查询各科成绩前三名的记录 + + + +-- 19.查询每门课程被选修的学生数 +select CourseId 课程名,count(CourseId)每门课程被选修的学生数 from StudentCourseScore group by CourseId + + +-- 20.查询出只选修两门课程的学生学号和姓名 +select StudentId,StudentName from StudentCourseScore +inner join StudentInfo on StudentCourseScore.StudentId=StudentInfo.StudentCode +group by StudentId,StudentName having count(StudentId)=2 + +-- 21.查询男生、女生人数 +select sex,count(Sex) from StudentInfo group by Sex + + +-- 22.查询名字中含有「风」字的学生信息 +select * from StudentInfo where StudentName like '%风%' + + +-- 23.查询同名同性学生名单，并统计同名人数 +SELECT StudentName, +COUNT(1) +FROM StudentInfo st +GROUP BY StudentName,Sex HAVING COUNT(1)>1 + + +-- 24.查询 1990 年出生的学生名单 +select * from StudentInfo where datepart(yyyy,Birthday)=1990 + + +-- 25.查询 每门课程的 平均成绩，结果按 平均成绩降序排列，平均成绩相同时，按 课程编号升序排列 +select CourseId,avg(Score) from StudentCourseScore group by CourseId order by avg(Score)DESC,CourseId ASC + + +-- 26.查询平均成绩大于等于 85 的所有学生的学号、姓名和平均成绩 +select StudentCode,StudentName,avg(Score) from StudentCourseScore +inner join StudentInfo on StudentInfo.StudentCode=StudentCourseScore.StudentId +group by StudentCode,StudentName having avg(Score)>=85 + + +-- 27.查询课程名称为「数学」，且分数低于 60 的学生姓名和分数 +select StudentName,Score from StudentInfo +inner join StudentCourseScore on StudentCourseScore.StudentId=StudentInfo.StudentCode +where CourseId=2 and Score<60 group by StudentName,Score + + +-- 28.查询所有学生的课程及分数情况（存在学生没成绩，没选课的情况） +select StudentName 姓名,CourseName 科目,Score 成绩 from StudentCourseScore +full join StudentInfo on StudentInfo.StudentCode=StudentCourseScore.StudentId +full join CourseInfo on StudentCourseScore.CourseId=CourseInfo.Id + +-- 29.查询任何一门课程成绩在 70 分以上的姓名、课程名称和分数 +select StudentName 姓名,CourseId 课程,Score 分数 from StudentCourseScore +inner join StudentInfo on StudentCourseScore.StudentId=StudentInfo.StudentCode +where Score>70 +group by StudentName,CourseId,Score + + +-- 30.查询不及格的课程 +select StudentName 姓名,CourseName 课程,Score 分数 from StudentCourseScore +inner join StudentInfo on StudentCourseScore.StudentId=StudentInfo.StudentCode +inner join CourseInfo on StudentCourseScore.CourseId=CourseInfo.Id +where Score<60 +group by StudentName,CourseId,CourseName,Score + + +-- 31.查询课程编号为 01 且课程成绩在 80 分以上的学生的学号和姓名 +select StudentId 学号,StudentName 姓名 from StudentCourseScore +inner join StudentInfo on StudentCourseScore.StudentId=StudentInfo.StudentCode +where CourseId=1 and Score>=80 +group by StudentId,StudentName + + +-- 32.求每门课程的学生人数 +select CourseId,count(CourseId) from StudentCourseScore group by CourseId + + +-- 33.成绩不重复，查询选修「张三」2老师所授课程的学生中，成绩最高的学生信息及其成绩 + + +select distinct StudentId 学号,Score 成绩 from StudentCourseScore +where score=(select max(Score) from StudentCourseScore where CourseId=2) + + + +--34.成绩有重复的情况下，查询选修「张三」老师所授课程的学生中，成绩最高的学生信息及其成绩 +select StudentId 学号,Score 成绩 from StudentCourseScore +where score=(select max(Score) from StudentCourseScore where CourseId=2) + + + +-- 35.查询不同课程成绩相同的学生的学生编号、课程编号、学生成绩 +SELECT StudentId,CourseId,score, +COUNT(1) +FROM StudentCourseScore st +GROUP BY StudentId,CourseId,Score HAVING COUNT(1)>1 +-- 36.查询每门功成绩最好的前两名 +select CourseId,Score from StudentCourseScore group by CourseId,Score order by Score DESC + + +-- 37.统计每门课程的学生选修人数（超过 5 人的课程才统计）。 +select CourseId from StudentCourseScore +group by CourseId having count(CourseId)>5 + + +-- 38.检索至少选修两门课程的学生学号 +select StudentId from StudentCourseScore +group by StudentId having count(StudentId)>=2 + + +-- 39.查询选修了全部课程的学生信息 +select StudentId from StudentCourseScore +group by StudentId having count(StudentId)=3 + + +-- 40.查询各学生的年龄，只按年份来算 +select * from StudentInfo where datediff(YY,GETDATE,Birthday) as shengri + + +-- 41.按照出生日期来算，当前月日 < 出生年月的月日则，年龄减一 + + + +-- 42.查询本周过生日的学生 + + + +-- 43.查询下周过生日的学生 + + + +-- 44.查询本月过生日的学生 + + + +-- 45.查询下月过生日的学生 + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + + -- Gitee