diff --git "a/38\345\274\240\345\205\210\346\235\260/\344\275\234\344\270\232/2022.9.28\344\275\234\344\270\232--.\344\272\213\345\212\241.sql" "b/38\345\274\240\345\205\210\346\235\260/\344\275\234\344\270\232/2022.9.28\344\275\234\344\270\232--.\344\272\213\345\212\241.sql"
new file mode 100644
index 0000000000000000000000000000000000000000..d26a839b655fb2f1d134be5cc1f463b072662eb3
--- /dev/null
+++ "b/38\345\274\240\345\205\210\346\235\260/\344\275\234\344\270\232/2022.9.28\344\275\234\344\270\232--.\344\272\213\345\212\241.sql"
@@ -0,0 +1,99 @@
+--假设刘备取款6000，(添加check约束，设置账户余额必须>=0)，要求：使用事务实现，修改余额和添加取款记录两步操作使用事务
+--账户余额>=0约束
+alter table BankCard add constraint CK_Money check(CardMoney >= 0)
+
+declare @myError int = 0
+declare @getMoney float = 6000
+declare @carID varchar(10)
+declare @name  varchar(10)
+declare @Phone varchar(10)
+set @name = '刘备'
+
+select @carID = (select b.CardNo from AccountInfo a inner join BankCard b on a.AccountId =b.AccountId where RealName = @name)
+select @Phone = (select a.AccountPhone from AccountInfo a inner join BankCard b on a.AccountId =b.AccountId where RealName = @name)
+--开始事务
+begin transaction A
+update BankCard set CardMoney -= @getMoney where CardNo = @carID
+set @myError += @@ERROR
+insert into CardExchange values(@carID,0,@getMoney,getdate())
+set @myError += @@ERROR
+--事务提交
+if(@myError = 0)
+begin
+	commit transaction A
+end
+else 
+begin
+	rollback transaction B
+end
+go
+
+--2.刘备向张飞转账1000元，(添加check约束，设置账户余额必须>=0)
+alter table BankCard add constraint CK_Money check(CardMoney >= 0)
+declare @myError int = 0
+declare @getMoney float = 1000
+declare @carID varchar(10)
+declare @carID1 varchar(10)
+declare @name  varchar(10)
+declare @name1  varchar(10)
+declare @Phone varchar(10)
+declare @Phone1 varchar(10)
+set @name = '刘备'
+set @name1 = '张飞'
+select @carID = (select b.CardNo from AccountInfo a inner join BankCard b on a.AccountId =b.AccountId where RealName = @name)
+select @Phone = (select a.AccountPhone from AccountInfo a inner join BankCard b on a.AccountId =b.AccountId where RealName = @name)
+select @carID1 = (select b.CardNo from AccountInfo a inner join BankCard b on a.AccountId =b.AccountId where RealName = @name1)
+select @Phone1 = (select a.AccountPhone from AccountInfo a inner join BankCard b on a.AccountId =b.AccountId where RealName = @name1)
+
+begin transaction A
+update BankCard set CardMoney -= @getMoney where CardNo = @carID
+set @myError += @@ERROR
+update BankCard set CardMoney += @getMoney where CardNo = @carID1
+set @myError += @@ERROR
+insert into CardTransfer values(@carID,@carID1,@getMoney,getdate())
+set @myError += @@ERROR
+
+if(@myError = 0)
+begin
+	commit transaction A
+end
+else 
+begin
+	rollback transaction B
+end
+
+
+--列转行
+CREATE TABLE grades1 (
+  id int NOT NULL ,
+  name varchar(20) DEFAULT NULL,
+  subject varchar(20) DEFAULT NULL,
+  score int DEFAULT NULL,
+
+)
+
+INSERT INTO grades1 VALUES (1, 'lyy', '英语', 100);
+INSERT INTO grades1 VALUES (2, 'lyy', '数学', 98);
+INSERT INTO grades1 VALUES (3, 'lyy', '语文', 97);
+INSERT INTO grades1 VALUES (4, 'gss', '英语', 89);
+INSERT INTO grades1 VALUES (5, 'gss', '数学', 88);
+INSERT INTO grades1 VALUES (6, 'gss', '语文', 87);
+INSERT INTO grades1 VALUES (7, 'liming', '英语', 79);
+INSERT INTO grades1 VALUES (8, 'liming', '数学', 77);
+INSERT INTO grades1 VALUES (9, 'liming', '语文', 75);
+
+select * from grades1
+
+select name,
+max(case subject when '英语' then score else 0 end)英语,
+max(case subject when '数学' then score else 0 end)数学,
+max(case subject when '语文' then score else 0 end)语文 
+from grades1 
+group by name
+
+select * from grades1 
+pivot
+(
+max(score)
+for subject in([英语],[数学],[语文])
+) as a
\ No newline at end of file
diff --git "a/38\345\274\240\345\205\210\346\235\260/\347\254\224\350\256\260/2022.9.28\347\254\224\350\256\260--\344\272\213\345\212\241.md" "b/38\345\274\240\345\205\210\346\235\260/\347\254\224\350\256\260/2022.9.28\347\254\224\350\256\260--\344\272\213\345\212\241.md"
new file mode 100644
index 0000000000000000000000000000000000000000..8d29b60b5388247fb66d5c874f9dceb59432cee9
--- /dev/null
+++ "b/38\345\274\240\345\205\210\346\235\260/\347\254\224\350\256\260/2022.9.28\347\254\224\350\256\260--\344\272\213\345\212\241.md"
@@ -0,0 +1,37 @@
+#### 浜嬪姟
+
+**浜嬪姟锛� Transaction锛夌敱涓�娆℃垨鑰呭娆″熀鏈搷浣滄瀯鎴愶紝鎴栬�呰锛屼簨鍔＄敱涓�鏉℃垨鑰呭鏉� SQL 璇彞鏋勬垚銆�**
+
+**浜嬪姟涓殑鎵�鏈� SQL 璇彞鏄竴涓暣浣擄紝鍏卞悓杩涢��锛屼笉鍙垎鍓诧紝瑕佷箞鍏ㄩ儴鎵ц鎴愬姛锛岃涔堝叏閮ㄦ墽琛屽け璐ャ��**
+
+
+
+#### 浜嬪姟鐨勫睘鎬�(ACID)
+
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+
+##### 1) 鍘熷瓙鎬�
+
+涓�涓簨鍔′腑鐨勬墍鏈� SQL 璇彞锛岃涔堝叏閮ㄦ墽琛屾垚鍔燂紝瑕佷箞鍏ㄩ儴鎵ц澶辫触锛屼笉浼氱粨鏉熷湪涓棿鐨勬煇涓幆鑺傘�備簨鍔″湪鎵ц杩囩▼涓彂鐢熼敊璇紝浼氳鍥炴粴锛圧ollback锛夊埌浜嬪姟寮�濮嬪墠鐨勭姸鎬侊紝灏卞儚杩欎釜浜嬪姟浠庢潵娌℃湁鎵ц杩囦竴鏍枫��
+
+##### 2) 涓�鑷存��
+
+鍦ㄤ簨鍔″紑濮嬩箣鍓嶅拰浜嬪姟缁撴潫浠ュ悗锛屾暟鎹簱鐨勫畬鏁存�ф病鏈夎鐮村潖銆傝繖琛ㄧず鍐欏叆鐨勬暟鎹繀椤诲畬鍏ㄧ鍚堟墍鏈夌殑棰勮瑙勫垯锛屽叾涓寘鍚暟鎹殑绮剧‘搴︺�佷覆鑱旀�т互鍙婂悗缁暟鎹簱鍙互鑷彂鎬у湴瀹屾垚棰勫畾鐨勫伐浣溿��
+
+##### 3) 闅旂鎬�
+
+鏁版嵁搴撳厑璁稿涓苟鍙戜簨鍔″悓鏃跺鍏舵暟鎹繘琛岃鍐欏拰淇敼鐨勮兘鍔涳紝闅旂鎬у彲浠ラ槻姝㈠涓簨鍔″苟鍙戞墽琛屾椂鐢变簬浜ゅ弶鎵ц鑰屽鑷存暟鎹殑涓嶄竴鑷淬�備簨鍔￠殧绂诲垎涓轰笉鍚岀骇鍒紝鍖呮嫭璇绘湭鎻愪氦锛圧ead uncommitted锛夈�佽鎻愪氦锛坮ead committed锛夈�佸彲閲嶅璇伙紙repeatable read锛夊拰涓茶鍖栵紙Serializable锛夈��  姝婚攣 鎿嶄綔绯荤粺
+
+##### 4) 鎸佷箙鎬�
+
+浜嬪姟澶勭悊缁撴潫鍚庯紝瀵规暟鎹殑淇敼灏辨槸姘镐箙鐨勶紝鍗充究绯荤粺鏁呴殰涔熶笉浼氫涪澶便��
+
+#### 浜嬪姟鍒嗙被
+
+**鑷姩鎻愪氦浜嬬墿**锛� 鏄疭QL Server榛樿鐨勪竴绉嶄簨鍔℃ā寮忥紝姣忔潯Sql璇彞閮借鐪嬫垚涓�涓簨鍔¤繘琛屽鐞嗐��
+
+**鏄惧紡浜嬪姟**: T-sql鏍囨槑锛岀敱Begin Transaction寮�鍚簨鍔″紑濮嬶紝鐢盋ommit Transaction 鎻愪氦浜嬪姟銆丷ollback Transaction 鍥炴粴浜嬪姟缁撴潫銆� 
+
+**闅愬紡浜嬪姟**锛氫娇鐢⊿et IMPLICIT_TRANSACTIONS ON 灏嗗皢闅愬紡浜嬪姟妯″紡鎵撳紑锛屼笉鐢˙egin Transaction寮�鍚簨鍔★紝褰撲竴涓簨鍔＄粨鏉燂紝杩欎釜妯″紡浼氳嚜鍔ㄥ惎鐢ㄤ笅涓�涓簨鍔★紝鍙敤Commit Transaction 鎻愪氦浜嬪姟銆丷ollback Transaction 鍥炴粴浜嬪姟鍗冲彲銆�
+
+![](D:\绯荤粺缂撳瓨\妗岄潰\鍥剧墖\image.png)
\ No newline at end of file