From 27545baf41890fe77aab1b1bd267f13c3c360fb3 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=83=91=E7=8E=AE=E5=96=86?= <lighten_up@yeah.net>
Date: Tue, 27 Sep 2022 22:44:59 +0800
Subject: [PATCH] =?UTF-8?q?=E7=AC=AC=E4=B8=83=E6=AC=A1=E4=BD=9C=E4=B8=9A?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 ...3\346\254\241\344\275\234\344\270\232.txt" | 30 +++++++++++++++++++
 .../2022.09.26-\350\247\206\345\233\276.md"   | 27 +++++++++++++++++
 2 files changed, 57 insertions(+)
 create mode 100644 "04\351\203\221\347\216\256\345\226\206/\344\275\234\344\270\232/2022.09.26-\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232.txt"
 create mode 100644 "04\351\203\221\347\216\256\345\226\206/\347\254\224\350\256\260/2022.09.26-\350\247\206\345\233\276.md"

diff --git "a/04\351\203\221\347\216\256\345\226\206/\344\275\234\344\270\232/2022.09.26-\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232.txt" "b/04\351\203\221\347\216\256\345\226\206/\344\275\234\344\270\232/2022.09.26-\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232.txt"
new file mode 100644
index 0000000..b1a33d4
--- /dev/null
+++ "b/04\351\203\221\347\216\256\345\226\206/\344\275\234\344\270\232/2022.09.26-\347\254\254\344\270\203\346\254\241\344\275\234\344\270\232.txt"
@@ -0,0 +1,30 @@
+--编写视图实现查询出所有银行卡账户信息，显示卡号，身份证，姓名，余额。
+create view v_information
+as
+select AccountCode,CardNo,RealName,CardMoney from AccountInfo inner join BankCard on BankCard.AccountId=AccountInfo.AccountId
+go
+select * from v_information
+drop view v_information
+
+
+
+--行转列
+create table huatai(
+	year int,
+	month int,
+	amount float
+)
+
+insert into huatai(year,month,amount) values (1991,1,1.1)
+insert into huatai(year,month,amount) values (1991,2,1.2)
+insert into huatai(year,month,amount) values (1991,3,1.3)
+insert into huatai(year,month,amount) values (1991,4,1.4)
+
+insert into huatai(year,month,amount) values (1992,1,2.1)
+insert into huatai(year,month,amount) values (1992,2,2.2)
+insert into huatai(year,month,amount) values (1992,3,2.3)
+insert into huatai(year,month,amount) values (1992,4,2.4)
+
+select * from huatai
+
+select * from huatai pivot(max(amount) for month in ([1],[2],[3],[4])) a
\ No newline at end of file
diff --git "a/04\351\203\221\347\216\256\345\226\206/\347\254\224\350\256\260/2022.09.26-\350\247\206\345\233\276.md" "b/04\351\203\221\347\216\256\345\226\206/\347\254\224\350\256\260/2022.09.26-\350\247\206\345\233\276.md"
new file mode 100644
index 0000000..e53d2df
--- /dev/null
+++ "b/04\351\203\221\347\216\256\345\226\206/\347\254\224\350\256\260/2022.09.26-\350\247\206\345\233\276.md"
@@ -0,0 +1,27 @@
+7、视图
+
+创建视图
+
+    create view V_name as select row_name from table_name
+
+删除视图
+
+    drop view V_name
+
+###  union
+
+    SELECT _column_name(s)_ FROM _table1_  
+    UNION  
+    SELECT _column_name(s)_ FROM _table2_
+
+### union all
+
+    SELECT _column_name(s)_ FROM _table1_  
+    UNION ALL  
+    SELECT _column_name(s)_ FROM _table2_
+
+### unpivot
+
+select  from Sales
+
+    unpivot (Amount for people in (A1,A2,A3,A4) as a
\ No newline at end of file
-- 
Gitee