From e266eb153c1038b01ee0248cdf29081a42c4295b Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=8D=A2=E5=9B=BD=E5=BB=BA?= <168718453@qq.com>
Date: Fri, 16 Sep 2022 04:51:08 +0000
Subject: [PATCH] =?UTF-8?q?=E5=8D=A2=E5=9B=BD=E5=BB=BA?=
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Signed-off-by: 卢国建 <168718453@qq.com>
---
 .../\344\275\234\344\270\232.sql"             | 98 +++++++++++++++++++
 .../\347\254\224\350\256\260.txt"             | 19 ++++
 2 files changed, 117 insertions(+)
 create mode 100644 "\344\275\234\344\270\232/\344\275\234\344\270\232.sql"
 create mode 100644 "\344\275\234\344\270\232/\347\254\224\350\256\260.txt"

diff --git "a/\344\275\234\344\270\232/\344\275\234\344\270\232.sql" "b/\344\275\234\344\270\232/\344\275\234\344\270\232.sql"
new file mode 100644
index 0000000..8266a0b
--- /dev/null
+++ "b/\344\275\234\344\270\232/\344\275\234\344\270\232.sql"
@@ -0,0 +1,98 @@
+create database DBTEST;
+use DBTEST;
+
+
+--������Ϣ��
+create table sectionInfo(
+
+--���ű��
+ sectionID int primary key identity (1001,1),
+
+--�������� 
+ sectionName varchar(10) not null
+
+);
+
+
+insert into sectionInfo (sectionName) values ('���۲�');
+insert into sectionInfo (sectionName) values('����');
+insert into sectionInfo (sectionName) values('ǰ�˿�����');
+insert into sectionInfo (sectionName) values('��˿�����');
+insert into sectionInfo (sectionName) values('���Բ�');
+
+
+select * from sectionInfo;
+
+
+--Ա����Ϣ��
+create table userInfo(
+
+--Ա�����
+  userNo int primary key identity (2001,1) not null,
+
+  --Ա������
+ userName  varchar(10) not null unique check(len(UserName)>4),
+ 
+--Ա���Ա� 
+ userSex varchar(2) not null check(userSex='��'or userSex='Ů'),
+
+ --Ա������ 
+ userAge int not null check(1<=userAge or userAge <=100),
+ 
+--Ա����ַ 
+ userAddress varchar(50) default('����'),
+
+--Ա�����ţ�������ò�����Ϣ���IJ��ű��
+ userSection int 
+);
+
+
+select * from userInfo;
+
+
+insert into userInfo(userName,userSex,userAge,userAddress,userSection) values('����������','��',22,'����',1001);
+insert into userInfo(userName,userSex,userAge,userAddress,userSection) values('����������','��',28,'����',1002);
+insert into userInfo(userName,userSex,userAge,userAddress,userSection) values('����������','��',35,'����',1003);
+insert into userInfo(userName,userSex,userAge,userAddress,userSection) values('����������','Ů',22,'����',1004);
+insert into userInfo(userName,userSex,userAge,userAddress,userSection) values('����������','Ů',56,'����',1005);
+
+
+
+--Ա�����ڱ�
+create table workinfo(
+
+--���ڱ��
+workID int primary key not null identity(3001,1),
+
+--����Ա��,���,���õ���Ա����Ϣ����Ա�����
+userId int  not null,
+
+--����ʱ��
+workTime datetime not null,
+
+--����˵��������ֻ���ǡ��ٵ����������ˡ������������������١������¼١��е�һ��
+workDescription varchar(40) not null ,
+
+check(workDescription='�ٵ�'or workDescription='����' or workDescription='����' or  workDescription='����' or workDescription='�¼�')
+
+);
+
+
+insert into  workinfo(userId,workTime,workDescription) values (2007,2021-2-11,'�ٵ�');
+insert into  workinfo(userId,workTime,workDescription) values (2008,2022-3-13,'����');
+insert into  workinfo(userId,workTime,workDescription) values (2009,2021-1-19,'����');
+insert into  workinfo(userId,workTime,workDescription) values (2010,2022-7-1,'����');
+insert into  workinfo(userId,workTime,workDescription) values (2011,2022-6-24,'�¼�');
+
+select * from workinfo;
+
+
+--���
+
+--Ա����Ϣ�������ű�
+ Alter table userInfo add constraint aaa foreign key (userSection) references sectionInfo(sectionID);
+
+--Ա�����ڱ���Ա����Ϣ��
+Alter table workinfo add constraint  bbb foreign key (userId) references userInfo(userNo);
+
+
diff --git "a/\344\275\234\344\270\232/\347\254\224\350\256\260.txt" "b/\344\275\234\344\270\232/\347\254\224\350\256\260.txt"
new file mode 100644
index 0000000..8036792
--- /dev/null
+++ "b/\344\275\234\344\270\232/\347\254\224\350\256\260.txt"
@@ -0,0 +1,19 @@
+create database（建数据库） DBTEST(数据库名称);
+use DBTEST;（使用数据库）
+
+
+create table(建表) userInfo(表名称)（这里是增加列
+语句1
+语句2
+.....
+
+）
+primary key 是主键
+列名+类型+primary key 是主键+identity (1001,1)（这是自增 其中1001是其实点，1是自增量） 非空就直接跟 not null 注：这些语句的顺序是不定的
+check检查  例如
+列名+类型 check（len是长度（列名=4））这就是固定这列的长度为4
+其中假如 需要的需求是大于1小于100是无法check（1<列名<100）的了，得用or（或者）来弄check（1<列名 or  列名>100）
+
+
+添加外键的方法有两种其中 Alter table 的意思是修改表结构 所以是在后面进行添加的 add就是添加的意思 constraint也就是固定结构 后面跟外键名称，foreign key也是固定 （）
+Alter table userInfo add constraint aaa foreign key (userSection) references sectionInfo(sectionID);
\ No newline at end of file
-- 
Gitee