diff --git "a/2021 04 02 \344\275\234\344\270\232/\347\216\213\351\200\270\351\243\236/SQLQuery1.sql" "b/2021 04 02 \344\275\234\344\270\232/\347\216\213\351\200\270\351\243\236/SQLQuery1.sql"
new file mode 100644
index 0000000000000000000000000000000000000000..180832bbb9627951fe5be026e83f6633f38c46ab
--- /dev/null
+++ "b/2021 04 02 \344\275\234\344\270\232/\347\216\213\351\200\270\351\243\236/SQLQuery1.sql"	
@@ -0,0 +1,61 @@
+use master
+go
+create database GoodsDB
+on(
+name='GoodsDB',
+filename='D:\GoodsDB_ldf',
+size=5,
+maxsize=100,
+filegrowth=5%
+
+
+)
+log on (
+name='GoodsDB_log',
+filename='D:\GoodsDB_log_mdf',
+size=5,
+maxsize=100,
+filegrowth=5%
+
+)
+go
+use GoodsDB
+go
+create table GoodsType
+(
+TypeID int primary key identity(1,1) not null,
+TypeName nvarchar(20) not null
+)
+create table GoodsInfo
+(
+GoodsID int primary key identity(1,1) not null,
+GoodsName nvarchar(20) not null,
+GoodsColor nvarchar(20) not null,
+GoodsBrand nvarchar(20),
+GoodsMoney money not null,
+TypeID int references GoodsType(TypeID)
+
+)
+insert into GoodsType values('服装内衣'),('鞋包服'),('手机数码')
+insert into GoodsInfo values('提花小西装', '红色','菲曼琪', '300', 1),
+('无袖背心',' 白色', '阿依莲', '700', 1),
+('低帮休闲鞋', '红色', '菲曼琪', '900', 2),
+('提花小西装', '红色','菲曼琪', '300', 1),
+('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),
+(' 显卡', '黑色', '技嘉','800', 3)
+
+
+--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 MAX(GoodsMoney) from GoodsInfo 
+select GoodsName 商品名称,GoodsMoney 商品价格 from GoodsInfo inner join GoodsType on GoodsInfo.TypeID=GoodsType.TypeID where 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 GoodsInfo.TypeID 商品编号,MAX(GoodsMoney)最高价格,min(GoodsMoney)最低价格 ,avg(GoodsMoney)平均价格 from GoodsInfo  inner join GoodsType on GoodsInfo.TypeID=GoodsType.TypeID  group by GoodsInfo.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  in(300 , 600)
\ No newline at end of file
diff --git "a/2021 04 02 \344\275\234\344\270\232/\347\216\213\351\200\270\351\243\236/SQLQuery2.sql" "b/2021 04 02 \344\275\234\344\270\232/\347\216\213\351\200\270\351\243\236/SQLQuery2.sql"
new file mode 100644
index 0000000000000000000000000000000000000000..1fb1473ae8ebc218ff35dcacb679e8218f9c4f00
--- /dev/null
+++ "b/2021 04 02 \344\275\234\344\270\232/\347\216\213\351\200\270\351\243\236/SQLQuery2.sql"	
@@ -0,0 +1,288 @@
+
+
+
+
+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
+
+-- 练习题目：
+select  * from StudentInfo
+select  * from Teachers
+select  * from CourseInfo
+select  * from  StudentCourseScore
+-- 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 StudentName,B.StudentId,B.Score 数学,A.Score 语文 FROM 
+(select CourseId,Score,StudentId from  StudentCourseScore  WHERE CourseId='2')A INNER JOIN 
+(select CourseId,Score,StudentId from  StudentCourseScore  WHERE CourseId='1')B INNER JOIN 
+StudentInfo ON B.StudentId=StudentInfo.id
+ON A.studentid=B.StudentId
+WHERE A.Score<B.Score
+
+-- 1.1 查询同时存在" 数学 "课程和" 语文 "课程的情况
+
+select StudentId from StudentCourseScore
+	where CourseId = 1 or CourseId = 2
+	 group by StudentId
+		HAVING COUNT(distinct 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 A WHERE A.CourseId='2')as t1 LEFT JOIN
+ (SELECT * from StudentCourseScore WHERE StudentCourseScore.CourseId='1')as t2 ON t1.Id=t2.Id  
+ right JOIN CourseInfo on t1.CourseId=CourseInfo.Id
+-- 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 StudentCourseScore.CourseId='1')as t1 left JOIN 
+(SELECT * from StudentCourseScore WHERE StudentCourseScore.CourseId='2')as t2 ON t1.Id=t2.Id
+right JOIN CourseInfo on t1.CourseId=CourseInfo.Id
+
+-- 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 C INNER JOIN StudentInfo S ON C.StudentId=S.Id 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 StudentCourseScore S LEFT  join StudentInfo  ST on S.StudentId=ST.Id 
+
+
+-- 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,StudentInfo.StudentName 学生姓名,count(*) 选课总数, sum(Score)总分  from StudentCourseScore
+ inner join StudentInfo on StudentCourseScore.StudentId=StudentInfo.Id 
+group by  StudentInfo.Id,StudentInfo.StudentName
+
+-- 4.1 查有成绩的学生信息
+
+select  * from  StudentCourseScore inner join StudentInfo on StudentCourseScore.Id=StudentInfo.Id
+
+-- 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  StudentCourseScore  inner join StudentInfo on StudentCourseScore.StudentId=StudentInfo.Id  inner join Teachers on StudentCourseScore.CourseId=Teachers.Id where  Teachers.Id=1
+
+-- 7.查询没有学全所有课程的同学的信息
+select distinct(s.StudentId),StudentInfo.StudentName,  s.*,sc1.score,sc2.score,sc3.score from StudentCourseScore s 
+left join StudentCourseScore sc1 on s.studentid = sc1.studentid and sc1.CourseId = '1'
+left join StudentCourseScore sc2 on s.studentid = sc2.studentid and sc2.CourseId = '2'
+left join StudentCourseScore sc3 on s.studentid = sc3.studentid and sc3.CourseId = '3'
+inner join StudentInfo on s.StudentId=StudentInfo.Id 
+where sc1.score is null or sc2.score is null or sc3.score is null
+
+
+-- 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 StudentCode ,StudentName from StudentCourseScore A
+	inner join StudentInfo B on A.StudentId = B.StudentCode
+		group by  StudentCode ,StudentName
+			having count(CourseId) > 0
+-- 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 StudentCode ,StudentName from StudentCourseScore A
+	inner join StudentInfo B on A.StudentId = B.StudentCode
+		group by  StudentCode ,StudentName
+			having count(CourseId)=(select COUNT(CourseName) from CourseInfo)
+
+-- 10.查询没学过"张三"老师讲授的任一门课程的学生姓名
+
+select distinct studentName from StudentCourseScore A
+	inner join CourseInfo B on A.CourseId = B.Id
+	inner join StudentInfo C on A.StudentId = C.StudentCode
+	inner join Teachers D on B.TeacherId = D.Id
+		where TeacherName != '张三'
+
diff --git "a/2021 04 02 \344\275\234\344\270\232/\347\216\213\351\200\270\351\243\236/SQLQuery3.sql" "b/2021 04 02 \344\275\234\344\270\232/\347\216\213\351\200\270\351\243\236/SQLQuery3.sql"
new file mode 100644
index 0000000000000000000000000000000000000000..11b06ac7e296af040556d3a0a6b74bd192e71ea7
--- /dev/null
+++ "b/2021 04 02 \344\275\234\344\270\232/\347\216\213\351\200\270\351\243\236/SQLQuery3.sql"	
@@ -0,0 +1,86 @@
+--1、创建数据库HOUSE_DB，
+--要求：
+--指定数据文件大小：5兆，
+--指定文件最大值：50兆，
+--文件增长率：1兆
+use master 
+go 
+
+create database HOUSE_DB
+on
+(
+	name = HOUSE_DB,
+	filename ='D:\HOUSE_DB.mfg',
+	size = 5MB,
+	maxsize = 50MB,
+	filegrowth = 1MB
+)
+use HOUSE_DB
+
+--2、创建数据表
+--房屋类型表（HOUSE_TYPE）
+--字段名	类型	是否可为空	约束	说明
+--type_id	int	N	主键，自增长	类型编号
+--type_name	varchar(50)	N	唯一约束	类型名称
+
+create table HOUSE_TYPE
+(
+	type_id int primary key identity ,
+	type_name varchar(20) unique 
+)
+
+--房屋信息表（HOUSE）
+--字段名	类型	是否可为空	约束	说明
+--house_id	int	N	主键，自增长	房屋编号
+--house_name	varchar(50)	N		房屋名称
+--house_price	float	N	默认值0	房租
+--type_id	int	N	外键依赖HOUSE_TYPE表	房屋类型
+
+create table HOUSE
+(
+	house_id int primary key identity ,
+	house_name varchar(50) ,
+	house_price float default('0'),
+	type_id int references HOUSE_TYPE(type_id)
+)
+
+--3、添加表数据
+--HOUSE_TYPE表中添加3条数据，例如：小户型、经济型、别墅
+--HOUSE表中添加至少3条数据，不能全都为同一类型
+
+insert into HOUSE_TYPE(type_name)
+select '小户型' union
+select '经济型' union
+select '别墅' 
+
+insert into HOUSE(house_name,house_price,type_id)
+select '蔡','5000','3' union
+select '东','10000','2' union
+select '生','50000','1' 
+
+--4、添加查询
+--查询所有房屋信息
+	
+select * from HOUSE A
+	inner join HOUSE_TYPE B on A.type_id = B.type_id
+
+--使用模糊查询包含”型“字的房屋类型信息
+
+select * from HOUSE A
+	inner join HOUSE_TYPE B on a.type_id = B.type_id
+		where type_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 名字,house_price 租金 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_name 名称,type_name 类型名称 from HOUSE A
+	inner join HOUSE_TYPE B on A.type_id = B.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 house_price ,house_name from HOUSE where house_price = (select MAX(house_price) from HOUSE)
+
diff --git "a/2021 04 02 \344\275\234\344\270\232/\347\216\213\351\200\270\351\243\236/SQLQuery4.sql" "b/2021 04 02 \344\275\234\344\270\232/\347\216\213\351\200\270\351\243\236/SQLQuery4.sql"
new file mode 100644
index 0000000000000000000000000000000000000000..cd3d67f97d3cb4545623816fb8e8c9fd1d4fcae9
--- /dev/null
+++ "b/2021 04 02 \344\275\234\344\270\232/\347\216\213\351\200\270\351\243\236/SQLQuery4.sql"	
@@ -0,0 +1,88 @@
+--1、创建明星数据库（StarManagerDB）,然后建立两张表，StarType（明星类型表），StarInfo（明星信息表），表结构分别如下：
+--StarType（明星类型表）
+--字段名	说明	类型	长度	可否为空	约束
+--T_NO	明星类型编号	int		否	主键约束，自增，标识种子和标识增量都是1
+--T_NAME	明星类型	nvarchar	20		
+
+use master
+go
+
+create database StarManagerDB
+go
+
+use StarManagerDB
+go
+
+create table  StarType
+(
+	T_NO int not null primary key identity(1,1),
+	T_NAME nvarchar(20)
+)
+
+--StarInfo（明星信息表）
+--字段名	说明	类型	长度	可否为空	约束
+--S_NO	明星编号	int		否	主键约束，自增，标识种子和标识增量都是1
+--S_NAME	明星姓名	nvarchar	20	否	
+--S_AGE	明星年龄	int		否	
+--S_HOBBY	特技	nvarchar	20		
+--S_NATIVE	明星籍贯	nvarchar	20		默认约束：中国大陆
+--S_T_NO	明星类型编号	int			外键，参照StarType表的主键T_NO
+
+create table StarInfo
+(
+	S_NO int not null primary key identity(1,1),
+	S_NAME nvarchar(20) not null,
+	S_AGE int not null,
+	S_HOBBY nvarchar(20) ,
+	S_NATIVE nvarchar(20) default('中国大陆'),
+	S_T_NO int references StarType(T_NO)
+)
+
+--2、使用插入语句为两张表添加数据
+
+--明星类型表（StarType） 
+--明星类型编号	明星类型
+--1	体育明星
+--2	IT明星
+--3	相声演员
+
+insert into StarType
+select '体育明星' union
+select 'IT明星' union
+select '相声演员' 
+
+--明星表（StarInfo）
+--明星编号	姓名	年龄	特技	籍贯	明星类型编号
+--1	梅西	30	射门	阿根廷	1
+--2	科比	35	过人	美国	1
+--3	蔡景现	40	敲代码	中国	2
+--4	马斯克	36	造火箭	外星人	2
+--5	郭德纲	50	相声	中国	3
+--6	黄铮	41	拼多多	中国	2
+
+insert into StarInfo(S_NAME,S_AGE,S_HOBBY,S_NATIVE,S_T_NO)
+select '梅西',30,'射门','阿根廷',1 union
+select '科比',35,'过人','美国',1 union
+select '蔡景现',40,'敲代码','中国',2 union
+select '马斯克',36,'造火箭','外星人',2 union
+select '郭德纲',50,'相声','中国',3 union
+select '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 as 姓名,S_AGE as 年龄,S_HOBBY as 特技,S_NATIVE as 籍贯信息 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 as 类型,count(*) as 人数,avg(S_Age) as 平均年龄 from StarInfo
+	group by S_T_NO
+
+
+--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 as 姓名,S_AGE as 年龄,S_HOBBY as 特技,S_NATIVE as 籍贯信息 from StarInfo
+	where S_T_NO = 1
+		order by S_AGE desc
+
+