From 6f82d8bd5019253d951a0688ec2d5ea16170bfd0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=8D=A0=E5=BF=97=E6=96=B0?= <1759998065@qq.com>
Date: Mon, 19 Sep 2022 17:36:47 +0800
Subject: [PATCH] =?UTF-8?q?=E7=AC=AC=E4=BA=8C=E6=AC=A1=E4=BD=9C=E4=B8=9A?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 .../9.15/.keep"                               |   0
 ...2\350\241\250\347\272\246\346\235\237.sql" | 108 ++++++++++++++++++
 .../9.15/9.15\347\254\224\350\256\260.txt"    |  30 +++++
 .../9.16/sql\346\237\245\350\257\242.txt"     |  19 +++
 ...4\346\254\241\344\275\234\344\270\232.sql" |  41 +++++++
 5 files changed, 198 insertions(+)
 create mode 100644 "05\345\215\240\345\277\227\346\226\260/9.15/.keep"
 create mode 100644 "05\345\215\240\345\277\227\346\226\260/9.15/2022-09-15-\345\273\272\345\272\223\345\273\272\350\241\250\347\272\246\346\235\237.sql"
 create mode 100644 "05\345\215\240\345\277\227\346\226\260/9.15/9.15\347\254\224\350\256\260.txt"
 create mode 100644 "05\345\215\240\345\277\227\346\226\260/9.16/sql\346\237\245\350\257\242.txt"
 create mode 100644 "05\345\215\240\345\277\227\346\226\260/9.16/\347\254\254\344\272\214\346\254\241\344\275\234\344\270\232.sql"

diff --git "a/05\345\215\240\345\277\227\346\226\260/9.15/.keep" "b/05\345\215\240\345\277\227\346\226\260/9.15/.keep"
new file mode 100644
index 0000000..e69de29
diff --git "a/05\345\215\240\345\277\227\346\226\260/9.15/2022-09-15-\345\273\272\345\272\223\345\273\272\350\241\250\347\272\246\346\235\237.sql" "b/05\345\215\240\345\277\227\346\226\260/9.15/2022-09-15-\345\273\272\345\272\223\345\273\272\350\241\250\347\272\246\346\235\237.sql"
new file mode 100644
index 0000000..9d31211
--- /dev/null
+++ "b/05\345\215\240\345\277\227\346\226\260/9.15/2022-09-15-\345\273\272\345\272\223\345\273\272\350\241\250\347\272\246\346\235\237.sql"
@@ -0,0 +1,108 @@
+--关系型数据库:SQL server, Mysql, Oracle 
+--创建数据库：create database 数据库名
+--database:数据库
+
+if exists (select * from sys.databases where name='DBTEST')
+ drop database DBTEST
+
+ create database DBTEST
+
+ --使用数据库
+ use DBTEST
+
+ --创建班级表
+ create table ClassInfo(
+	ClassId int primary key identity(1,1),
+	ClassName varchar(20)
+ );
+
+ --插入数据： insert [into] 表名(字段名) values(值)
+ insert into ClassInfo( ClassName) values('软件1班');
+ 
+ insert ClassInfo values('软件2班')
+
+ select * from ClassInfo
+
+ --创建数据表
+ create table StuInfo(
+	stuId int primary key identity(1001,1),  --学生ID
+	--添加一个检查约束，判断用户插入/新增的数据，性别字段是不是男或者女
+	--default:默认约束
+	--check
+	stugender varchar(2) not null default('男') check(stugender='男' or stugender='女'),   --学生性别
+	stuphone char(11) check(len(stuphone)=11) unique,
+	--创建班级外键
+	--ClassID int references ClassInfo(ClassID)
+	ClassID int
+	
+ );
+
+
+ --增加外键
+ --修改表结构 表名 add constraint 约束名 foreign key(要引用的字段) references 主键表(字段)
+ Alter table StuInfo add constraint FK_StuInfo_ClassId foreign key(ClassID) references ClassInfo(ClassID)
+
+
+ --新增姓名列
+ alter table StuInfo add stuName varchar(20)
+
+
+
+ --如果没给出列名，默认是按照顺序一个个添加
+ --insert StuInfo values('女',13888888888)
+
+ --insert StuInfo(stuphone) values(15888888888)
+
+
+
+ select * from StuInfo;
+
+ --字符串：char(5),varchar(5),nvarchar(5)之间区别是什么
+
+
+
+ --删除表:drop table 表名
+ drop table StuInfo
+
+
+ --非空
+
+ --约束，自增(标识列)
+
+ --外键
+ --主键：默认唯一列
+ --默认
+ --唯一：
+ --check检查:
+
+ --插入数据：insert into
+
+ create table sectionInfo(
+	sectionID int primary key identity(1,1),
+	sectionName varchar(10) not null
+ );
+
+ create table userInfo(
+	userNo int primary key identity(1,1),
+	userName varchar(10) unique not null check(len(userName)>4),
+	userSex varchar(2) not null check(userSex='男' or userSex='女'),
+	userAge int not null check(userAge>=1 and userAge<=100),
+	userAddress varchar(50) default('湖北'),
+	userSection int references sectionInfo(sectionID),
+
+	 );
+create table workInfo(
+	workId int primary key identity(1,1),
+	userId int references userInfo(userNo),
+	workTime datetime not null,
+	workDescription varchar(40) check(workDescription='迟到' or workDescription='早退' or workDescription='旷工' or workDescription='病假' or workDescription='事假'), 
+);
+insert into sectionInfo(sectionName) values ('实践部'),('市场部'),('销售部'),('管理部'),('财务部');
+
+insert into userInfo(userName) values ('张三'),('李四'),('王五'),('赵六'),('黄七');
+insert into userInfo(userSex) values ('女'),('男'),('女'),('男'),('女');
+insert into userInfo(userAge) values ('23'),('25'),('48'),('21'),('45');
+insert into userInfo(userAddress) values ('福建'),('江苏'),('北京'),('上海'),('广东');
+
+insert into workInfo(workTime) values ('2'),('1'),('3'),('4'),('6');
+insert into workInfo(workDescription) values ('迟到'),('早退'),('旷工'),('病假'),('事假');
\ No newline at end of file
diff --git "a/05\345\215\240\345\277\227\346\226\260/9.15/9.15\347\254\224\350\256\260.txt" "b/05\345\215\240\345\277\227\346\226\260/9.15/9.15\347\254\224\350\256\260.txt"
new file mode 100644
index 0000000..fb584b3
--- /dev/null
+++ "b/05\345\215\240\345\277\227\346\226\260/9.15/9.15\347\254\224\350\256\260.txt"
@@ -0,0 +1,30 @@
+1.鍒涘缓鏁版嵁搴�
+create database 鏁版嵁搴�
+2.鍒涘缓鏁版嵁琛�
+create table 鏁版嵁琛�
+渚嬶細
+create table stuInfo(
+id int primary key identity(1,1),
+name varchar(2)
+);
+3.浣跨敤鏁版嵁搴�
+use 鏁版嵁搴撳悕
+4.鍒犻櫎琛�
+drop table 琛ㄥ悕
+7.鍞竴绱㈠紩
+unique
+8.闀垮害
+len锛�**锛�
+9.澶栭敭
+references 琛ㄥ悕(鍒楀悕)
+10.涓婚敭
+primary key
+11.鑷
+identity(x,x)
+绗竴浣嶄负璧峰鏁帮紝绗簩浣嶅鍔犳暟
+12.闈炵┖
+not null
+13.榛樿鍊�
+default('鐢�')
+14.妫�鏌�
+check(age='鐢�' or age='濂�')
diff --git "a/05\345\215\240\345\277\227\346\226\260/9.16/sql\346\237\245\350\257\242.txt" "b/05\345\215\240\345\277\227\346\226\260/9.16/sql\346\237\245\350\257\242.txt"
new file mode 100644
index 0000000..e5aa989
--- /dev/null
+++ "b/05\345\215\240\345\277\227\346\226\260/9.16/sql\346\237\245\350\257\242.txt"
@@ -0,0 +1,19 @@
+1.鍏宠仈琛ㄥ悕
+select * from ***  inner join ** on ***.1=**.1
+2.鏁伴噺
+count()
+3.鎬诲拰
+ sum()
+4.骞冲潎
+avg()
+5.鏈�楂�
+max()
+6.鏈�浣�
+min()
+7.鍒嗙粍
+group by
+having鍙兘鐢ㄥ湪group by涔嬪悗锛屽鍒嗙粍鍚庣殑缁撴灉杩涜绛涢��(鍗充娇鐢╤aving鐨勫墠鎻愭潯浠舵槸鍒嗙粍)銆�
+where鑲畾鍦╣roup by 涔嬪墠
+8.鎺掑簭
+order by ** desc/闄嶅簭
+asc/鍗囧簭
\ No newline at end of file
diff --git "a/05\345\215\240\345\277\227\346\226\260/9.16/\347\254\254\344\272\214\346\254\241\344\275\234\344\270\232.sql" "b/05\345\215\240\345\277\227\346\226\260/9.16/\347\254\254\344\272\214\346\254\241\344\275\234\344\270\232.sql"
new file mode 100644
index 0000000..7efe3b5
--- /dev/null
+++ "b/05\345\215\240\345\277\227\346\226\260/9.16/\347\254\254\344\272\214\346\254\241\344\275\234\344\270\232.sql"
@@ -0,0 +1,41 @@
+select * from Department
+select * from [Rank]
+select * from People 
+
+--1. 查询出武汉地区所有的员工信息，要求显示部门名称以及员工的详细资料
+select *,DepartmentName from People inner join Department on People.DepartmentId=Department.DepartmentId where PeopleAddress='武汉';
+--2. 查询出武汉地区所有的员工信息，要求显示部门名称，职级名称以及员工的详细资料
+select *,DepartmentName,RankName from People inner join Department on People.DepartmentId=Department.DepartmentId inner join Rank on Rank.RankId=People.RankId where PeopleAddress='武汉';
+--3. 根据部门分组统计员工人数，员工工资总和，平均工资，最高工资和最低工资。
+select DepartmentName,COUNT(PeopleId)员工工资总和,avg(PeopleSalary)平均工资,sum(PeopleSalary)员工工资总和,max(PeopleSalary)最高工资,min(PeopleSalary)最低工资 from Department inner join People on Department.DepartmentId=People.DepartmentId
+group by DepartmentName;
+--4. 根据部门分组统计员工人数，员工工资总和，平均工资，最高工资和最低工资，平均工资在10000 以下的不参与统计，并且根据平均工资降序排列。
+select DepartmentName,count(PeopleId)员工工资总和,avg(Peoplesalary)平均工资,max(PeopleSalary)最高工资,min(PeopleSalary)最低工资 from People inner join 
+Department on Department.DepartmentId=People.DepartmentId  
+group by DepartmentName
+having avg(PeopleSalary)>=10000
+order by 平均工资 desc;
+--5. 根据部门名称，然后根据职位名称，分组统计员工人数，员工工资总和，平均工资，最高工资和最低工资
+select DepartmentName,RankName,count(PeopleId)员工人数,sum(PeopleSalary)员工工资总和,max(PeopleSalary)最高工资,min(PeopleSalary)最低工资 from People
+ inner join Department on People.DepartmentId=Department.DepartmentId
+inner join Rank on People.RankId=Rank.RankId
+group by DepartmentName,RankName
+--查询所有员工信息，添加一列显示属相(鼠,牛,虎,兔,龙,蛇,马,羊,猴,鸡,狗,猪)
+select *,case YEAR(PeopleBirth)%12
+when 0 then '猴'
+when 1 then '鸡'
+when 2 then '狗'
+when 3 then '猪'
+when 4 then '鼠'
+when 5 then '牛'
+when 6 then '虎'
+when 7 then '兔'
+when 8 then '龙'
+when 9 then '蛇'
+when 10 then '马'
+when 11 then '羊'
+end 属相
+ from People
+--查询出巨蟹 6.22--7.22 的员工信息
+select * from people
+where(MONTH(PeopleBirth)=6 and day(PeopleBirth)>=22)or(MONTH(PeopleBirth)=7 and day(PeopleBirth)<=22);
\ No newline at end of file
-- 
Gitee