From 9afbb98e6d9a8b5dea2ca56a3f975452c24e3c3c Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E4=BD=95=E7=9D=BF?= <2476310189@qq.com> Date: Wed, 7 Sep 2022 04:23:53 +0000 Subject: [PATCH 1/8] =?UTF-8?q?=E6=96=B0=E5=BB=BA=202022-9-6?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../\344\275\234\344\270\232/2022-9-6/.keep" | 0 1 file changed, 0 insertions(+), 0 deletions(-) create mode 100644 "06\344\275\225\347\235\277/\344\275\234\344\270\232/2022-9-6/.keep" diff --git "a/06\344\275\225\347\235\277/\344\275\234\344\270\232/2022-9-6/.keep" "b/06\344\275\225\347\235\277/\344\275\234\344\270\232/2022-9-6/.keep" new file mode 100644 index 0000000..e69de29 -- Gitee From fc6bc0bc1355e9c3f9dbe8dea1e24bdf0b969897 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E4=BD=95=E7=9D=BF?= <2476310189@qq.com> Date: Wed, 7 Sep 2022 04:25:35 +0000 Subject: [PATCH 2/8] =?UTF-8?q?=E4=BD=9C=E4=B8=9A?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: 何睿 <2476310189@qq.com> --- .../2022-9-6/\344\275\234\344\270\2321.md" | 181 ++++++++++++++++++ ...34\344\270\232\351\242\230\347\233\256.md" | 35 ++++ 2 files changed, 216 insertions(+) create mode 100644 "06\344\275\225\347\235\277/\344\275\234\344\270\232/2022-9-6/\344\275\234\344\270\2321.md" create mode 100644 "06\344\275\225\347\235\277/\344\275\234\344\270\232/2022-9-6/\344\275\234\344\270\232\351\242\230\347\233\256.md" diff --git "a/06\344\275\225\347\235\277/\344\275\234\344\270\232/2022-9-6/\344\275\234\344\270\2321.md" "b/06\344\275\225\347\235\277/\344\275\234\344\270\232/2022-9-6/\344\275\234\344\270\2321.md" new file mode 100644 index 0000000..f36fc30 --- /dev/null +++ "b/06\344\275\225\347\235\277/\344\275\234\344\270\232/2022-9-6/\344\275\234\344\270\2321.md" @@ -0,0 +1,181 @@ +```SQL +create database BankTest; +go +use banktest; +go +--账户信息表：存储个人信息 +create table AccountInfo +( + AccountId int primary key identity(1,1), --账户编号 + AccountCode varchar(20) not null, --身份证号码 + AccountPhone varchar(20) not null, --电话号码 + RealName varchar(20) not null, --真实姓名 + OpenTime smalldatetime not null, --开户时间 +) +--银行卡表：存储银行卡信息 +create table BankCard +( + CardNo varchar(30) primary key, --银行卡卡号 + AccountId int not null, --账户编号（与账户信息表形成主外键关系） + CardPwd varchar(30) not null, --银行卡密码 + CardMoney money not null, --银行卡余额 + CardState int not null,--1:正常,2:挂失,3:冻结,4:注销 + CardTime smalldatetime default(getdate()) --开卡时间 +) +--交易信息表（存储存钱和取钱的记录） +create table CardExchange +( + ExchangeId int primary key identity(1,1), --交易自动编号 + CardNo varchar(30) not null, --银行卡号(与银行卡表形成主外键关系) + MoneyInBank money not null, --存钱金额 + MoneyOutBank money not null, --取钱金额 + ExchangeTime smalldatetime not null, --交易时间 +) +--转账信息表（存储转账信息记录） +create table CardTransfer +( + TransferId int primary key identity(1,1),--转账自动编号 + CardNoOut varchar(30) not null, --转出银行卡号(与银行卡表形成主外键关系) + CardNoIn varchar(30) not null, --转入银行卡号(与银行卡表形成主外键关系) + TransferMoney money not null,--交易金额 + TransferTime smalldatetime not null, --交易时间 +) +--状态信息变化表（存储银行卡状态变化的记录，状态有1:正常,2:挂失,3:冻结,4:注销） +create table CardStateChange +( + StateId int primary key identity(1,1),--状态信息自动编号 + CardNo varchar(30) not null, --银行卡号(与银行卡表形成主外键关系) + OldState int not null, --银行卡原始状态 + NewState int not null, --银行卡新状态 + StateWhy varchar(200) not null, --状态变化原因 + StateTime smalldatetime not null, --记录产生时间 +) + + + +--为刘备，关羽，张飞三个人进行开户开卡的操作 +--刘备身份证：420107198905064135 +--关羽身份证：420107199507104133 +--张飞身份证：420107199602034138 +insert into AccountInfo(AccountCode,AccountPhone,RealName,OpenTime) +values('420107198905064135','13554785425','刘备',GETDATE()) +insert into BankCard(CardNo,AccountId,CardPwd,CardMoney,CardState) +values('6225125478544587',1,'123456',0,1) + +insert into AccountInfo(AccountCode,AccountPhone,RealName,OpenTime) +values('420107199507104133','13454788854','关羽',GETDATE()) +insert into BankCard(CardNo,AccountId,CardPwd,CardMoney,CardState) +values('6225547858741263',2,'123456',0,1) + +insert into AccountInfo(AccountCode,AccountPhone,RealName,OpenTime) +values('420107199602034138','13456896321','张飞',GETDATE()) +insert into BankCard(CardNo,AccountId,CardPwd,CardMoney,CardState) +values('6225547854125656',3,'123456',0,1) + +select * from AccountInfo +select * from BankCard + + + +--进行存钱操作，刘备存钱2000元，关羽存钱：8000元，张飞存钱：500000元 +select * from AccountInfo +update BankCard set CardMoney = CardMoney + 2000 where CardNo = '6225125478544587' +insert into CardExchange(CardNo,MoneyInBank,MoneyOutBank,ExchangeTime) +values('6225125478544587',2000,0,GETDATE()) + +update BankCard set CardMoney = CardMoney + 8000 where CardNo = '6225547858741263' + +insert into CardExchange(CardNo,MoneyInBank,MoneyOutBank,ExchangeTime) +values('6225547858741263',8000,0,GETDATE()) + +update BankCard set CardMoney = CardMoney + 500000 where CardNo = '6225547854125656' +insert into CardExchange(CardNo,MoneyInBank,MoneyOutBank,ExchangeTime) +values('6225547854125656',500000,0,GETDATE()) + +--转账：刘备给张飞转账1000元 +update BankCard set CardMoney = CardMoney -1000 where CardNo = '6225125478544587' +update BankCard set CardMoney = CardMoney + 1000 where CardNo = '6225547854125656' + +insert into CardTransfer(CardNoOut,CardNoIn,TransferMoney,TransferTime) +values('6225125478544587','6225547854125656',1000,GETDATE()) + + + +select * from AccountInfo --个人信息 +select * from BankCard --银行卡信息 +select * from CardStateChange --银行卡状态更改表 +select * from CardTransfer --转账表 +select * from CardExchange --交易记录 + +--1. 为赵云此人进行开户开卡操作，赵云身份证：420107199904054233 +insert into AccountInfo(AccountCode,AccountPhone,RealName,OpenTime) +values('420107199904054233','12345678978','赵云',GETDATE()) +insert into BankCard(CardNo,AccountId,CardPwd,CardMoney,CardState) +values('6225125488888888',4,'123456',0,1) +--2. 需要求出张飞的银行卡卡号和余额，张飞身份证：420107199602034138 （1.使用连接查询，2.使用变量） +declare @CardNo varchar(40) +declare @CardMoney varchar(40) +select @CardNo = CardNo ,@CardMoney = CardMoney from AccountInfo +join BankCard on AccountInfo.AccountId = BankCard.AccountId +where AccountCode = 420107199602034138 +print @CardNo +char(9)+ convert(varchar(20),@CardMoney) +print @CardMoney + +--​ 3.某用户银行卡号为“6225547854125656”，该用户执行取钱操作，取钱5000元，余额充足则进行取钱操作，并提示"取钱成功"，否则提示“余额不足”。 +declare @MoneyOutBank money, @CardNo varchar(40),@CardMoney money; +set @CardNo='6225547854125656'; +set @MoneyOutBank=5000; +select @CardMoney=CardMoney from BankCard +where CardNo='6225547854125656'; +print @CardMoney +if @CardMoney>@MoneyOutBank +begin +update BankCard set CardMoney = CardMoney -@MoneyOutBank where CardNo =@CardNo +insert into CardExchange(CardNo,MoneyInBank,MoneyOutBank,ExchangeTime) +values(@CardNo,0,@MoneyOutBank,GETDATE()) +print '取钱成功' +end +else +begin +print '余额不足' +end +--​ 4.查询银行卡信息，将银行卡状态1,2,3,4分别转换为汉字“正常,挂失,冻结,注销”，并且根据银行卡余额显示银行卡等级 30万以下为“普通用户”,30万及以上为"VIP用户"， +----显示列分别为卡号，身份证，姓名，余额，用户等级，银行卡状态。 +select CardNo,AccountCode,RealName,CardMoney, +case +when cardmoney>=300000 then 'VIP用户' +when cardmoney<=300000 then '普通用户' +end '用户等级', +case +when CardState=1 then '正常' +when CardState=2 then '挂失' +when CardState=3 then '冻结' +when CardState=4 then '注销' +end '用户状态' +from AccountInfo +join BankCard on AccountInfo.AccountId=BankCard.AccountId + +--​ 5.循环打印1-10。 +declare @a int =1 +while @a<=10 +begin +print @a +set @a=@a+1; +end +--​ 6.打印99乘法表 +declare @i int = 1 +while @i<=9 +begin + declare @j int = 1 + declare @result varchar(500) = '' + while @j<=@i + begin + set @result = @result + cast(@i as varchar(1)) + ' * ' + cast(@j as varchar(1)) + ' = '+ cast(@i*@j as varchar(1)) + char(9) + set @j =@j + 1 + end + print @result + set @i = @i + 1 +end + +``` + diff --git "a/06\344\275\225\347\235\277/\344\275\234\344\270\232/2022-9-6/\344\275\234\344\270\232\351\242\230\347\233\256.md" "b/06\344\275\225\347\235\277/\344\275\234\344\270\232/2022-9-6/\344\275\234\344\270\232\351\242\230\347\233\256.md" new file mode 100644 index 0000000..a7e6712 --- /dev/null +++ "b/06\344\275\225\347\235\277/\344\275\234\344\270\232/2022-9-6/\344\275\234\344\270\232\351\242\230\347\233\256.md" @@ -0,0 +1,35 @@ + + +## 作业 + +#### 变量 + +1. 为赵云此人进行开户开卡操作，赵云身份证：420107199904054233 +2. 需要求出张飞的银行卡卡号和余额，张飞身份证：420107199602034138 （1.使用连接查询，2.使用变量） + +#### 逻辑控制 + +##### 条件分支if-else + +​ 3.某用户银行卡号为“6225547854125656”，该用户执行取钱操作，取钱5000元，余额充足则进行取钱操作，并提示"取钱成功"，否则提示“余额不足”。 + +##### 条件分支:case-when + +​ 4.查询银行卡信息，将银行卡状态1,2,3,4分别转换为汉字“正常,挂失,冻结,注销”，并且根据银行卡余额显示银行卡等级 30万以下为“普通用户”,30万及以上为"VIP用户"， +--显示列分别为卡号，身份证，姓名，余额，用户等级，银行卡状态。 + +##### **while** + +​ 5.循环打印1-10。 + +​ 6.打印99乘法表 + +## 练习: + +在 StuScore 表中如果学生的平均成绩没有达到80分，便给每位同学的数学成绩加1分，然后再次判断平均成绩是否达到80分，否则继续加分，这样反复加分，直到其平均成绩超过80分。 + +​ 思路： + +​ 第一步，计算 StuScore 表中学生的平均成绩。 +​ 第二步，如果平均成绩没有达到80分，执行加分操作。 +​ 第三步，循环判断。 \ No newline at end of file -- Gitee From cfef97837b3453bd12cb9fb55e1c753600de5833 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E4=BD=95=E7=9D=BF?= <2476310189@qq.com> Date: Wed, 7 Sep 2022 04:29:17 +0000 Subject: [PATCH 3/8] =?UTF-8?q?=E6=96=B0=E5=BB=BA=202022-9-6?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../\347\254\224\350\256\260/2022-9-6/.keep" | 0 1 file changed, 0 insertions(+), 0 deletions(-) create mode 100644 "06\344\275\225\347\235\277/\347\254\224\350\256\260/2022-9-6/.keep" diff --git "a/06\344\275\225\347\235\277/\347\254\224\350\256\260/2022-9-6/.keep" "b/06\344\275\225\347\235\277/\347\254\224\350\256\260/2022-9-6/.keep" new file mode 100644 index 0000000..e69de29 -- Gitee From 7d0cfe110761e7e353536bcdaed084c67c4ea022 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E4=BD=95=E7=9D=BF?= <2476310189@qq.com> Date: Wed, 7 Sep 2022 04:29:41 +0000 Subject: [PATCH 4/8] =?UTF-8?q?=E7=AC=94=E8=AE=B0?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: 何睿 <2476310189@qq.com> --- .../2022-9-6\347\254\224\350\256\260.md" | 170 ++++++++++++++++++ 1 file changed, 170 insertions(+) create mode 100644 "06\344\275\225\347\235\277/\347\254\224\350\256\260/2022-9-6/2022-9-6\347\254\224\350\256\260.md" diff --git "a/06\344\275\225\347\235\277/\347\254\224\350\256\260/2022-9-6/2022-9-6\347\254\224\350\256\260.md" "b/06\344\275\225\347\235\277/\347\254\224\350\256\260/2022-9-6/2022-9-6\347\254\224\350\256\260.md" new file mode 100644 index 0000000..5d11d91 --- /dev/null +++ "b/06\344\275\225\347\235\277/\347\254\224\350\256\260/2022-9-6/2022-9-6\347\254\224\350\256\260.md" @@ -0,0 +1,170 @@ + + +## 回顾 + +设计数据库的步骤为 + +1. 建模：信息收集、绘制E-R图 +2. 模型转换：用数据模型建表 +3. 规范化：运用三范式 + 1. 第一范式(1NF)：确保列的原子性 + 2. 第二范式(2NF)：使每列都和主键关联 + 3. 第三范式(3NF)：使每列都和主键直接关联 + +## 变量与逻辑控制 + +- 掌握变量的定义和使用 +- 掌握输出语句 +- 掌握逻辑控制语句 +- 理解批处理的概念 + +### 变量 + +#### 局部变量 + +局部变量必须以标记@作为前缀 ，如@age +局部变量的使用是先声明，再赋值 +局部变量只在定义它的局部范围内有效 + + + +声明一个局部变量：**declare @变量名 数据类型** + +```sql +--例： + declare @id int --声明一个名为id的整型变量 + declare @name varchar(50) --声明一个可变长度为50的存放姓名的字符串变量 + +``` + +赋值： + +- set @变量名 = 值 + +- select @变量名 = 值 + +```sql +--例: + select @id = 1001 + set @name = '周飘' +``` + +set与select赋值的区别： + +set赋值给变量指定的值，select一般用于表中查询出的数据赋值给变量，如果查询结果有多条，取最后一条赋值给变量 + + + +练习：要求根据座位号找出张无忌的前后同学？ + +![1662309889066](1662309889066.png) + + + +#### 全局变量 + +全局变量必须以标记@@作为前缀，如@@version +全局变量由**系统定义和维护**，我们**只能读取，不能修改全局变量的值** +全局变量在整个SQL环境下都可以被访问或调用 + +```sql +--@@ERROR：返回执行的上一个语句的错误号 +--@@IDENTITY：返回最后插入的标识值 +--@@MAX_CONNECTIONS：返回允许同时进行的最大用户连接数 +--@@ROWCOUNT：返回受上一语句影响的行数 +--@@SERVERNAME：返回运行 SQL Server 的本地服务器的名称 +--@@SERVICENAME：返回 SQL Server 正在其下运行的注册表项的名称 +--@@TRANCOUNT：返回当前连接的活动事务数 +--@@LOCK_TIMEOUT：返回当前会话的当前锁定超时设置（毫秒） +``` + + + +## 输出语句 + +1. print变量或表达式 +2. select变量或表达式 + +```sql +--例: + print '数据库服务器名:' + @@servicename + select 15*8 +``` + + + +#### 使用convert函数 + +​ 由于PRINT 命令向客户端返回一个结果的字符串的信息。如果变量值不是字符串的话必须先用数据类型转换函数 CONVERT 将其转换为字符串。 + +```sql +--显示自动编号 +print '当前自动编号的值:' + convert(varchar(10),@@IDENTITY) +``` + +## 逻辑控制语句 + +#### if条件分支 + +![1662377697247](1662377697247.png) + +问题： +统计分析本班男生的平均成绩和女生的平均成绩，如果男生的平均成绩高于女生则输出“男生成绩优于女生”，并显示男生第一名的信息。否则输出“女生成绩优于男生”，并显示女生第一名的信息。 +分析： +第一步，分别统计男生和女生的平均成绩并存入局部变量中。 +第二步，用IF-ELSE结构判断，输出结果。 + + + +#### 循环控制语句 + +![1662377859010](1662377859010.png) + +##### while：可以通过break和continue控制循环语句中的执行。 + +#### 逻辑控制语句 + +![1662377940867](1662377940867.png) + +##### case 多分支语句 + + + +## 批处理语句 + +go语句特点: + +1. 等待go语句前的代码执行完成后，再执行go后面的代码。 +2. 批处理语句的结束标志。 + +```sql +--下面的@num变量作用域为全局 +--declare @num int +--set @num = 0 + +--下面的@num变量的作用域是局部，只在两个go之间可以使用，最后一行代码会报错 +--.........sql代码 +--go +--declare @num int +--set @num = 0 +--go +--set @num = 1 +``` + + + + + +## 总结 + +变量的使用。要先用DECLARE 关键字声明，然后用SET或SELECT赋值。局部变量前必须有 “@” 作前缀，全局变量必须有 “@@” 作前缀。 +变量的输出可以用：PRINT或SELECT语句。 +逻辑控制语句提供了条件操作所需的顺序和逻辑。 +了解T-SQL编写工具。 +批处理可以提高语句执行的效率，使用“GO”作为结束标志。 + +**备注** + +（1）特殊字符：制表符 CHAR(9)；换行符 CHAR(10)；回车 CHAR(13)； + +（2）循环中若出现break和CONTINUE,作用与Java，C#等语言一致。 \ No newline at end of file -- Gitee From 1cfcf8f243d1ea1e718d6b47de8a06ab33549e08 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E4=BD=95=E7=9D=BF?= <2476310189@qq.com> Date: Wed, 7 Sep 2022 13:02:18 +0000 Subject: [PATCH 5/8] =?UTF-8?q?=E6=96=B0=E5=BB=BA=202022-9-7?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../\344\275\234\344\270\232/2022-9-7/.keep" | 0 1 file changed, 0 insertions(+), 0 deletions(-) create mode 100644 "06\344\275\225\347\235\277/\344\275\234\344\270\232/2022-9-7/.keep" diff --git "a/06\344\275\225\347\235\277/\344\275\234\344\270\232/2022-9-7/.keep" "b/06\344\275\225\347\235\277/\344\275\234\344\270\232/2022-9-7/.keep" new file mode 100644 index 0000000..e69de29 -- Gitee From 1190ca65e8eca37e4a5c0d183b8f350ee6be8883 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E4=BD=95=E7=9D=BF?= <2476310189@qq.com> Date: Wed, 7 Sep 2022 13:02:53 +0000 Subject: [PATCH 6/8] =?UTF-8?q?=E4=BD=9C=E4=B8=9A?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: 何睿 <2476310189@qq.com> --- .../2022-9-7/\344\275\234\344\270\232.md" | 144 ++++++++++++++++++ ...\344\270\232\351\242\230\347\233\256.docx" | Bin 0 -> 13363 bytes 2 files changed, 144 insertions(+) create mode 100644 "06\344\275\225\347\235\277/\344\275\234\344\270\232/2022-9-7/\344\275\234\344\270\232.md" create mode 100644 "06\344\275\225\347\235\277/\344\275\234\344\270\232/2022-9-7/\344\275\234\344\270\232\351\242\230\347\233\256.docx" diff --git "a/06\344\275\225\347\235\277/\344\275\234\344\270\232/2022-9-7/\344\275\234\344\270\232.md" "b/06\344\275\225\347\235\277/\344\275\234\344\270\232/2022-9-7/\344\275\234\344\270\232.md" new file mode 100644 index 0000000..17cdfb3 --- /dev/null +++ "b/06\344\275\225\347\235\277/\344\275\234\344\270\232/2022-9-7/\344\275\234\344\270\232.md" @@ -0,0 +1,144 @@ +```sql +create database BankTest; +go +use banktest; +go +--账户信息表：存储个人信息 +create table AccountInfo +( + AccountId int primary key identity(1,1), --账户编号 + AccountCode varchar(20) not null, --身份证号码 + AccountPhone varchar(20) not null, --电话号码 + RealName varchar(20) not null, --真实姓名 + OpenTime smalldatetime not null, --开户时间 +) +--银行卡表：存储银行卡信息 +create table BankCard +( + CardNo varchar(30) primary key, --银行卡卡号 + AccountId int not null, --账户编号（与账户信息表形成主外键关系） + CardPwd varchar(30) not null, --银行卡密码 + CardMoney money not null, --银行卡余额 + CardState int not null,--1:正常,2:挂失,3:冻结,4:注销 + CardTime smalldatetime default(getdate()) --开卡时间 +) +--交易信息表（存储存钱和取钱的记录） +create table CardExchange +( + ExchangeId int primary key identity(1,1), --交易自动编号 + CardNo varchar(30) not null, --银行卡号(与银行卡表形成主外键关系) + MoneyInBank money not null, --存钱金额 + MoneyOutBank money not null, --取钱金额 + ExchangeTime smalldatetime not null, --交易时间 +) +--转账信息表（存储转账信息记录） +create table CardTransfer +( + TransferId int primary key identity(1,1),--转账自动编号 + CardNoOut varchar(30) not null, --转出银行卡号(与银行卡表形成主外键关系) + CardNoIn varchar(30) not null, --转入银行卡号(与银行卡表形成主外键关系) + TransferMoney money not null,--交易金额 + TransferTime smalldatetime not null, --交易时间 +) +--状态信息变化表（存储银行卡状态变化的记录，状态有1:正常,2:挂失,3:冻结,4:注销） +create table CardStateChange +( + StateId int primary key identity(1,1),--状态信息自动编号 + CardNo varchar(30) not null, --银行卡号(与银行卡表形成主外键关系) + OldState int not null, --银行卡原始状态 + NewState int not null, --银行卡新状态 + StateWhy varchar(200) not null, --状态变化原因 + StateTime smalldatetime not null, --记录产生时间 +) + + + +--为刘备，关羽，张飞三个人进行开户开卡的操作 +--刘备身份证：420107198905064135 +--关羽身份证：420107199507104133 +--张飞身份证：420107199602034138 +insert into AccountInfo(AccountCode,AccountPhone,RealName,OpenTime) +values('420107198905064135','13554785425','刘备',GETDATE()) +insert into BankCard(CardNo,AccountId,CardPwd,CardMoney,CardState) +values('6225125478544587',1,'123456',0,1) + +insert into AccountInfo(AccountCode,AccountPhone,RealName,OpenTime) +values('420107199507104133','13454788854','关羽',GETDATE()) +insert into BankCard(CardNo,AccountId,CardPwd,CardMoney,CardState) +values('6225547858741263',2,'123456',0,1) + +insert into AccountInfo(AccountCode,AccountPhone,RealName,OpenTime) +values('420107199602034138','13456896321','张飞',GETDATE()) +insert into BankCard(CardNo,AccountId,CardPwd,CardMoney,CardState) +values('6225547854125656',3,'123456',0,1) + +select * from AccountInfo +select * from BankCard + + + +--进行存钱操作，刘备存钱2000元，关羽存钱：8000元，张飞存钱：500000元 +select * from AccountInfo +update BankCard set CardMoney = CardMoney + 2000 where CardNo = '6225125478544587' +insert into CardExchange(CardNo,MoneyInBank,MoneyOutBank,ExchangeTime) +values('6225125478544587',2000,0,GETDATE()) + +update BankCard set CardMoney = CardMoney + 8000 where CardNo = '6225547858741263' + +insert into CardExchange(CardNo,MoneyInBank,MoneyOutBank,ExchangeTime) +values('6225547858741263',8000,0,GETDATE()) + +update BankCard set CardMoney = CardMoney + 500000 where CardNo = '6225547854125656' +insert into CardExchange(CardNo,MoneyInBank,MoneyOutBank,ExchangeTime) +values('6225547854125656',500000,0,GETDATE()) + +--转账：刘备给张飞转账1000元 +update BankCard set CardMoney = CardMoney -1000 where CardNo = '6225125478544587' +update BankCard set CardMoney = CardMoney + 1000 where CardNo = '6225547854125656' + +insert into CardTransfer(CardNoOut,CardNoIn,TransferMoney,TransferTime) +values('6225125478544587','6225547854125656',1000,GETDATE()) + + + +select * from AccountInfo --个人信息 +select * from BankCard --银行卡信息 +select * from CardStateChange --银行卡状态更改表 +select * from CardTransfer --转账表 +select * from CardExchange --交易记录 + +--1. 关羽的银行卡号为"6225547858741263"，查询出余额比关羽多的银行卡信息，显示卡号，身份证，姓名，余额。 +select cardno,Accountcode,realname,cardmoney from BankCard +join AccountInfo on BankCard.AccountId=AccountInfo.AccountId +where CardMoney>all(select CardMoney from BankCard where CardNo=6225547858741263) + +--2. 从所有账户信息中查询出余额最高的交易明细(存钱取钱信息)。 +select *from CardExchange +where MoneyInBank = (select max(MoneyInBank)from CardExchange) or MoneyOutBank =(select max(MoneyOutBank)from CardExchange) + +--3. 查询有取款记录的银行卡及账户信息，显示卡号，身份证，姓名，余额。 +select BankCard.cardno,Accountcode,realname,cardmoney from BankCard +join AccountInfo on BankCard.AccountId=AccountInfo.AccountId +join CardExchange on BankCard.CardNo=CardExchange.CardNo +where MoneyOutBank >0 +--4. 查询出没有存款记录的银行卡及账户信息，显示卡号，身份证，姓名，余额。 +select CardNo ,AccountCode,RealName,CardMoney +from BankCard +left join AccountInfo on AccountInfo.AccountId=BankCard.AccountId +where CardNo not in(select CardNo from CardExchange where MoneyInBank>0) +--5. 关羽的银行卡号为"6225547858741263",查询当天是否有收到转账。 +select * from CardTransfer +where CardNoIn =6225547858741263 +--6. 查询出交易次数（存款取款操作）最多的银行卡账户信息，显示：卡号，身份证，姓名，余额，交易数。 +select BankCard.CardNo,AccountCode,RealName,CardMoney,count(CardExchange.CardNo) 交易数 from CardExchange +join BankCard on BankCard.CardNo = CardExchange.CardNo +join AccountInfo on AccountInfo.AccountId = BankCard.AccountId +where CardExchange.CardNo=(select top 1 CardExchange.CardNo from CardExchange group by CardExchange.CardNo order by count(CardExchange.CardNo) desc) +group by CardExchange.CardNo,BankCard.CardNo,AccountCode,RealName,CardMoney +--7. 查询出没有转账交易记录的银行卡账户信息，显示卡号，身份证，姓名，余额。 +select CardNo,AccountCode,RealName,CardMoney from BankCard +join AccountInfo on AccountInfo.AccountId = BankCard.AccountId +where BankCard.CardNo!=any(select CardNoIn from CardTransfer) and BankCard.CardNo!=any(select CardNoOut from CardTransfer) + +``` + diff --git "a/06\344\275\225\347\235\277/\344\275\234\344\270\232/2022-9-7/\344\275\234\344\270\232\351\242\230\347\233\256.docx" "b/06\344\275\225\347\235\277/\344\275\234\344\270\232/2022-9-7/\344\275\234\344\270\232\351\242\230\347\233\256.docx" new file mode 100644 index 0000000000000000000000000000000000000000..ffd3a831cbe8597bcc6c2555b93b82017df91ca4 GIT binary patch literal 13363 zcmeHOg;yL)vtQiZEd&T2f-Mq)ySuwvu;9U+;O-jSgS)#E+zIaP&f8ph_uhQ>yno<* zvuCGIPxr5;cBZ7Ot5#M50umDd4S)pz03-mWC~FmCFaRJI3IM5}Ya%01le}-{b%B6R3_IGVfwQ6}s_%_8qUC6K|x-?HM_p&bLIixi6YPS9d?c&PwnS 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g4FK4_`y2az7++ZlD3Evo0EnOu*w313#-F|a0Ta6hi2wiq literal 0 HcmV?d00001 -- Gitee From 310f660d7f20793e64e6d6c548e69ffc90501ce5 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E4=BD=95=E7=9D=BF?= <2476310189@qq.com> Date: Wed, 7 Sep 2022 13:04:02 +0000 Subject: [PATCH 7/8] =?UTF-8?q?=E6=96=B0=E5=BB=BA=202022-9-7?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit --- .../\347\254\224\350\256\260/2022-9-7/.keep" | 0 1 file changed, 0 insertions(+), 0 deletions(-) create mode 100644 "06\344\275\225\347\235\277/\347\254\224\350\256\260/2022-9-7/.keep" diff --git "a/06\344\275\225\347\235\277/\347\254\224\350\256\260/2022-9-7/.keep" "b/06\344\275\225\347\235\277/\347\254\224\350\256\260/2022-9-7/.keep" new file mode 100644 index 0000000..e69de29 -- Gitee From e606f977ad1058bf9f00c0783798ead9f075fd8d Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?=E4=BD=95=E7=9D=BF?= <2476310189@qq.com> Date: Wed, 7 Sep 2022 13:05:21 +0000 Subject: [PATCH 8/8] =?UTF-8?q?=E7=AC=94=E8=AE=B0?= MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Signed-off-by: 何睿 <2476310189@qq.com> --- .../2022-09-07\347\254\224\350\256\260.md" | 39 +++++++++++++++++++ 1 file changed, 39 insertions(+) create mode 100644 "06\344\275\225\347\235\277/\347\254\224\350\256\260/2022-9-7/2022-09-07\347\254\224\350\256\260.md" diff --git "a/06\344\275\225\347\235\277/\347\254\224\350\256\260/2022-9-7/2022-09-07\347\254\224\350\256\260.md" "b/06\344\275\225\347\235\277/\347\254\224\350\256\260/2022-9-7/2022-09-07\347\254\224\350\256\260.md" new file mode 100644 index 0000000..1e65692 --- /dev/null +++ "b/06\344\275\225\347\235\277/\347\254\224\350\256\260/2022-9-7/2022-09-07\347\254\224\350\256\260.md" @@ -0,0 +1,39 @@ +# 子查询 + +## 1.按结果分类 + +### 1.标量子查询 + +​ 标量子查询是指子查询返回的是单一值，如一个数字或一个字符串。 + +### 2.列子查询 + +​ 列子查询是指子查询返回的结果集是N行1列，该结果通常来自对表某个字段的查询结果，带in关键字的子查询是最常用的一类子查询，在使用in关键字进行查询时，子查询语句返回的结果应该是一个数据列中的多个值,如果仅返回1个数值，则可用标量子查询代替。 + +#### 1.In关键字 + +​ in代表:只要符合后面的条件就筛选出来。 + +#### 2.any关键字 + +#### 3.some关键字 + +#### 4.all关键字 + +​ >,<,= + +### 3.行子查询 + +​ 行子查询是指子查询返回的结果集是1行N列，该子查询的结果通常是对表的某行数据进行查询而返回的结果集。 + +### 4.表子查询 + +​ 1.from关键字 + +## 2.按位置分类 + +​ 1.from子查询 + +​ 2.where子查询 + +​ 3.wxists子查询 \ No newline at end of file -- Gitee