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"18\346\235\250\346\231\250\345\223\262/\347\254\224\350\256\260/9.5\345\217\230\351\207\217.md" (100%) rename "18\346\235\250\346\231\250\345\223\262/9.6\351\200\273\350\276\221\346\216\247\345\210\266.md" => "18\346\235\250\346\231\250\345\223\262/\347\254\224\350\256\260/9.6\351\200\273\350\276\221\346\216\247\345\210\266.md" (100%) rename "18\346\235\250\346\231\250\345\223\262/9.7\345\255\220\346\237\245\350\257\242.md" => "18\346\235\250\346\231\250\345\223\262/\347\254\224\350\256\260/9.7\345\255\220\346\237\245\350\257\242.md" (100%) rename "18\346\235\250\346\231\250\345\223\262/9.8.md" => "18\346\235\250\346\231\250\345\223\262/\347\254\224\350\256\260/9.8.md" (100%) diff --git "a/18\346\235\250\346\231\250\345\223\262/\344\275\234\344\270\232/9.20\346\270\270\346\240\207.md" "b/18\346\235\250\346\231\250\345\223\262/\344\275\234\344\270\232/9.20\346\270\270\346\240\207.md" new file mode 100644 index 0000000..6db1ea3 --- /dev/null +++ "b/18\346\235\250\346\231\250\345\223\262/\344\275\234\344\270\232/9.20\346\270\270\346\240\207.md" @@ -0,0 +1,28 @@ +---创建学生游标，该游标包含(学生姓名,兴趣爱好,生源地，荣誉总数) +declare cur cursor scroll for select name,hobby,ori_loca,prize from tb_student tt,tb_inf_student it where tt.stu_num=it.stu_num +open cur +declare @name varchar(10),@aihao varchar(20),@location varchar(20) +fetch first from cur into @name,@hobby,@loca,@prize +print @name+' '+@aihao+' '+@location +----- 循环遍历161开头的学生信息 +declare St cursor scroll for (select * from tb_student where stu_num like '161%') + +open St + +declare @num int ,@n varchar(10),@Sex varchar(4),@Birt varchar(10) ,@sch varchar(20),@maj varchar(20) + +fetch first from St into @num,@n ,@Sex ,@Birt ,@sch ,@maj + +while (@@FETCH_STATUS=0) +begin + +print convert(varchar(20),@num)+','+@n+ ','+@Sex+','+@Birt+','+@sch+','+@maj + +fetch next from St into @num,@n ,@Sex ,@Birt ,@sch ,@maj + +end + +close St + + +deallocate St diff --git "a/18\346\235\250\346\231\250\345\223\262/\344\275\234\344\270\232/9.21\345\207\275\346\225\260.md" "b/18\346\235\250\346\231\250\345\223\262/\344\275\234\344\270\232/9.21\345\207\275\346\225\260.md" new file mode 100644 index 0000000..c1d39fe --- /dev/null +++ "b/18\346\235\250\346\231\250\345\223\262/\344\275\234\344\270\232/9.21\345\207\275\346\225\260.md" @@ -0,0 +1,30 @@ +--（1）编写一个函数求该银行的金额总和 +go +create function Sum() +returns decimal +as +begin + declare @sum decimal + select @sum = (select sum(CardMoney) from BankCard) + return @sum +end +go +select dbo.Sum() + +--（2）传入账户编号，返回账户真实姓名 +go +create function Name +@id int +returns varchar(10) +as + begin + declare @name varchar(10) + select @name = (select RealName from AccountInfo join BankCard on BankCard.AccountId=AccountInfo.AccountId where AccountInfo.AccountId=@id) + return @name + end +go +select dbo.Name(10) +select * from AccountInfo +select * from BankCard +select * from CardStateChange +select * from CardExchange \ No newline at end of file diff --git "a/18\346\235\250\346\231\250\345\223\262/\344\275\234\344\270\232/9.6\346\237\245\350\257\242\344\275\234\344\270\232.md" "b/18\346\235\250\346\231\250\345\223\262/\344\275\234\344\270\232/9.6\346\237\245\350\257\242\344\275\234\344\270\232.md" new file mode 100644 index 0000000..21a0ce9 --- /dev/null +++ "b/18\346\235\250\346\231\250\345\223\262/\344\275\234\344\270\232/9.6\346\237\245\350\257\242\344\275\234\344\270\232.md" @@ -0,0 +1,92 @@ +--1. 为赵云此人进行开户开卡操作，赵云身份证：420107199904054233 +declare @zy varchar(20), @zyp varchar(20),@zyN varchar(20),@zyT smalldatetime +set @zy='420107199904054233' +set @zyp='12345678978' +set @zyN='赵云' +set @zyT=GETDATE() +insert AccountInfo values(@zy,@zyp,@zyN,@zyT) + +declare @zyc varchar(30),@zyi int, @zym varchar(30),@zyq money ,@zyz int, @zyti smalldatetime +set @zyc='6225547854165656' +set @zyi='4' +set @zym='123456' +set @zyq='500000' +set @zyz='1' +set @zyti=GETDATE() +insert BankCard values(@zyc,@zyi,@zym,@zyq,@zyz,@zyti) + + + +--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 @ZF varchar(20),@Carmoney money +select @ZF= CardNo from AccountInfo inner join BankCard on AccountInfo.AccountId=BankCard.AccountId where BankCard.AccountId='3' +select @Carmoney= CardMoney from AccountInfo inner join BankCard on AccountInfo.AccountId=BankCard.AccountId where BankCard.AccountId='3' +print @ZF +print @Carmoney +--#### 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”。 +declare @Money money +select @Money=CardMoney from BankCard where CardNo='6225547854125656' +print @Money +if @Money>=5000 +begin + set @Money=@Money-5000 + print'取钱成功' + print @Money +end +else print'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。 + +select CardNo 卡号,AccountCode 身份证,RealName 姓名,CardMoney 余额, +case +when CardMoney>=300000 then 'VIP用户' +when CardMoney>=0 then '普通用户' +else '无' +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 '银行卡状态' +from BankCard inner join AccountInfo on BankCard.AccountId=AccountInfo.AccountId +--**while** + + + +--​ 5.循环打印1-10。 +declare @a int=1 +while (@a<10) +begin + set @a=@a+1 + print @a +end + + +--6、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 \ No newline at end of file diff --git "a/18\346\235\250\346\231\250\345\223\262/\344\275\234\344\270\232/9.7\345\255\220\346\237\245\350\257\242\344\275\234\344\270\232.md" "b/18\346\235\250\346\231\250\345\223\262/\344\275\234\344\270\232/9.7\345\255\220\346\237\245\350\257\242\344\275\234\344\270\232.md" new file mode 100644 index 0000000..ea479cb --- /dev/null +++ "b/18\346\235\250\346\231\250\345\223\262/\344\275\234\344\270\232/9.7\345\255\220\346\237\245\350\257\242\344\275\234\344\270\232.md" @@ -0,0 +1,34 @@ +--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 bc.CardNo,ac.AccountCode,ac.RealName,bc.CardMoney from AccountInfo ac +inner join BankCard bc on ac.AccountId = bc.AccountId +where bc.CardMoney > all(select bc.CardMoney from AccountInfo ac + inner join BankCard bc on ac.AccountId = bc.AccountId + where ac.RealName = '关羽') + +--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 bc.CardNo, ce.MoneyInBank 存钱 , ce.MoneyOutBank 取钱 from CardExchange ce +inner join BankCard bc on ce.CardNo = bc.CardNo +where bc.CardMoney = (select max(BankCard.CardMoney) from BankCard) + +--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 b.* from CardStateChange c +inner join BankCard b on b.CardNo=c.CardNo +where c.CardNo =some (select CardNo from CardExchange 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 b.* from CardStateChange c +inner join BankCard b on b.CardNo=c.CardNo +where c.CardNo =some (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。 + +if exists(select * from CardTransfer where CardNoIn = '6225547858741263' +and convert(varchar(10),TransferTime, 120) = convert(varchar(10),getdate(), 120) +) + print '有转账记录' +else + print '没有转账记录' +--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 b.CardNo 卡号 ,AccountCode 身份证,RealName 姓名,CardMoney 余额,交易次数 from AccountInfo a +inner join BankCard b on a.AccountId=b.AccountId +inner join (select CardNo, count(*) 交易次数 from CardExchange group by CardNo) T on b.CardNo=T.CardNo +where 交易次数 =(select max(交易次数) from (select CardNo,count(*) 交易次数 from CardExchange group by CardNo) T) \ No newline at end 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zBGIth9diAW)!24`7N9NAHTsxrs3Z0~UZ>*p{rAe3Q|g&QuLKRZNb3C)g#aO?=i0ae z?MNtVdD{gd(F&?SYS|yw68L*7VP){#V~q>@5q$l&sbB+1&%?_e*8bS7Hud1 literal 0 HcmV?d00001 diff --git "a/18\346\235\250\346\231\250\345\223\262/9.14\345\210\206\351\241\265\347\264\242\345\274\225.md" "b/18\346\235\250\346\231\250\345\223\262/\347\254\224\350\256\260/9.14\345\210\206\351\241\265\347\264\242\345\274\225.md" similarity index 100% rename from "18\346\235\250\346\231\250\345\223\262/9.14\345\210\206\351\241\265\347\264\242\345\274\225.md" rename to "18\346\235\250\346\231\250\345\223\262/\347\254\224\350\256\260/9.14\345\210\206\351\241\265\347\264\242\345\274\225.md" diff --git "a/18\346\235\250\346\231\250\345\223\262/9.15\350\247\206\345\233\276.md" "b/18\346\235\250\346\231\250\345\223\262/\347\254\224\350\256\260/9.15\350\247\206\345\233\276.md" similarity index 100% rename from "18\346\235\250\346\231\250\345\223\262/9.15\350\247\206\345\233\276.md" rename to "18\346\235\250\346\231\250\345\223\262/\347\254\224\350\256\260/9.15\350\247\206\345\233\276.md" diff --git "a/18\346\235\250\346\231\250\345\223\262/\347\254\224\350\256\260/9.19\344\272\213\345\212\241.md" "b/18\346\235\250\346\231\250\345\223\262/\347\254\224\350\256\260/9.19\344\272\213\345\212\241.md" new file mode 100644 index 0000000..ac00e6c --- /dev/null +++ "b/18\346\235\250\346\231\250\345\223\262/\347\254\224\350\256\260/9.19\344\272\213\345\212\241.md" @@ -0,0 +1,27 @@ +## 事务 + +#### 概念 + +**事务（ Transaction）由一次或者多次基本操作构成，或者说，事务由一条或者多条 SQL 语句构成。** + +**事务中的所有 SQL 语句是一个整体，共同进退，不可分割，要么全部执行成功，要么全部执行失败。** + +##### 一般来说，事务具有四个标准属性 + +##### 1.原子性 2.一致性 3.隔离性 4.持久性 + + + +#### 开始事务 + +COMMIT;或者START TRANSACTION; + +#### 提交事务 + +COMMIT; + +#### 回滚事务 + +Rollback； + +#### \ No newline at end of file diff --git "a/18\346\235\250\346\231\250\345\223\262/9.1SQL\351\253\230\347\272\247\347\254\224\350\256\260.md" "b/18\346\235\250\346\231\250\345\223\262/\347\254\224\350\256\260/9.1SQL\351\253\230\347\272\247\347\254\224\350\256\260.md" similarity index 100% rename from "18\346\235\250\346\231\250\345\223\262/9.1SQL\351\253\230\347\272\247\347\254\224\350\256\260.md" rename to "18\346\235\250\346\231\250\345\223\262/\347\254\224\350\256\260/9.1SQL\351\253\230\347\272\247\347\254\224\350\256\260.md" diff --git "a/18\346\235\250\346\231\250\345\223\262/\347\254\224\350\256\260/9.20\346\270\270\346\240\207.md" "b/18\346\235\250\346\231\250\345\223\262/\347\254\224\350\256\260/9.20\346\270\270\346\240\207.md" new file mode 100644 index 0000000..2201109 --- /dev/null +++ "b/18\346\235\250\346\231\250\345\223\262/\347\254\224\350\256\260/9.20\346\270\270\346\240\207.md" @@ -0,0 +1,29 @@ +## 游标 + +游标(cursor)是一个存储在MySQL服务器上的数据库查询，它不是一条SELECT语句，而是被该语句检索出来的结果集。在存储了游标之后，应用程序可以根据需要滚动或浏览其中的数据。 + +游标主要用于交互式应用，其中用户需要滚动屏幕上的数据，并对数据进行浏览或做出更改。不像多数DBMS，MySQL游标只能用于存储过程(和函数)。 + +#### 游标5个组成部分 + +1、声明 + +declare 游标名 cursor + +for + +select 语句 + + 2、打开 + +open 游标名; + + 3、从游标中查找信息 + +fetch...from 游标名 + +4、关闭 + +close 游标名； + +5、释放 \ No newline at end of file diff --git "a/18\346\235\250\346\231\250\345\223\262/\347\254\224\350\256\260/9.21\345\207\275\346\225\260.md" "b/18\346\235\250\346\231\250\345\223\262/\347\254\224\350\256\260/9.21\345\207\275\346\225\260.md" new file mode 100644 index 0000000..94fbac1 --- /dev/null +++ "b/18\346\235\250\346\231\250\345\223\262/\347\254\224\350\256\260/9.21\345\207\275\346\225\260.md" @@ -0,0 +1,53 @@ +## 函数 + +#### 函数分为 + +#### （1）系统函数: + +**从数据库返回在SQLSERVER中的值、对象或设置的特殊信息**（用于返回元数据或配置设置）； + + + + +#### （2）自定义函数(方法：将一个功能封装成可重用的函数)。 + +##### (1)标量值函数（标量函数是基于输入的值，输出一个单一的值。） + +CREATE FUNCTION function_name(@parameter_name parameter_data_type) +RETURNS date_type + +[WITH ENCRYPTION] + +[AS] + +BEGIN + + function_body + + RETURN 表达式; + +END + +##### （2）表值函数（返回查询结果） + +表值函数提供强大的结果集生成能力。它可以在查询内部表或视图允许的任何地方使用。表值函数在使用上比返回一个结果集的[存储过程](https://so.csdn.net/so/search?q=存储过程&spm=1001.2101.3001.7020)更灵活，因为函数的结果集可以联接到查询中的其他表。 + +语法： + +create function 名称 + +([{@参数名称 参数类型[=默认值]}[,n]]) + +returns @局部变量 table（参数名 参数类型） + +[with encryption] + +[as] + +begin + +函数体 + +return 函数返回值 + +end \ No newline at end of file diff --git "a/18\346\235\250\346\231\250\345\223\262/\347\254\224\350\256\260/9.22\346\255\273\351\224\201.md" "b/18\346\235\250\346\231\250\345\223\262/\347\254\224\350\256\260/9.22\346\255\273\351\224\201.md" new file mode 100644 index 0000000..2b892b6 --- /dev/null +++ "b/18\346\235\250\346\231\250\345\223\262/\347\254\224\350\256\260/9.22\346\255\273\351\224\201.md" @@ -0,0 +1,29 @@ +## 死锁 + +#### 原因 + +##### SQL Server数据库死锁，通俗的讲就是两个或多个trans，同时请求对方正在请求的某个实际应用对象，而导致双方互相等待。简单的例子如下： + +sql server死锁表现一: + +> 　　 一个用户A 访问表A(锁住了表A),然后又访问表B。 +> 　　 另一个用户B 访问表B(锁住了表B),然后企图访问表A， +> 　　 这时用户A由于用户B已经锁住表B，它必须等待用户B释放表B,才能继续，好了他老人家就只好老老实实在这等了，同样用户B要等用户A释放表A才能继续，这就造成死锁了。 + +sql server死锁解决方法： +　　 这种死锁是由于你的程序的BUG产生的，除了调整你的程序的逻辑别无他法 +　　 仔细分析你程序的逻辑， +　　 1：尽量避免同时锁定两个资源 +　　 2: 必须同时锁定两个资源时，要保证在任何时刻都应该按照相同的顺序来锁定资源. + +**sql server死锁表现二:** + +> 　　 用户A读一条纪录，然后修改该条纪录。 +> 　　 这时用户B修改该条纪录，这里用户A的事务里锁的性质由共享锁企图上升到独占锁(for update),而用户B里的独占锁由于A有共享锁存在所以必须等A释 +> 　　 放掉共享锁，而A由于B的独占锁而无法上升的独占锁也就不可能释放共享锁，于是出现了死锁。 +> 　　 这种死锁比较隐蔽，但其实在稍大点的项目中经常发生 + +**sql server死锁解决方法:** +　　 让用户A的事务（即先读后写类型的操作),在select 时用Update lock +语法如下： +　　 select * from table1 with(updlock) where .... \ No newline at end of file diff --git "a/18\346\235\250\346\231\250\345\223\262/9.5\345\217\230\351\207\217.md" "b/18\346\235\250\346\231\250\345\223\262/\347\254\224\350\256\260/9.5\345\217\230\351\207\217.md" similarity index 100% rename from "18\346\235\250\346\231\250\345\223\262/9.5\345\217\230\351\207\217.md" rename to "18\346\235\250\346\231\250\345\223\262/\347\254\224\350\256\260/9.5\345\217\230\351\207\217.md" diff --git 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"b/18\346\235\250\346\231\250\345\223\262/\347\254\224\350\256\260/9.8.md" similarity index 100% rename from "18\346\235\250\346\231\250\345\223\262/9.8.md" rename to "18\346\235\250\346\231\250\345\223\262/\347\254\224\350\256\260/9.8.md" -- Gitee