diff --git "a/data/2.MySQL\344\270\255\351\230\266/2. \346\237\245\350\257\242/6.UNION/union.json" "b/data/2.MySQL\344\270\255\351\230\266/2. \346\237\245\350\257\242/6.UNION/union.json"
index b71330f7f4380a3e215b34936ded3e8f3e9d0d9c..9d37523b3cf9ad15fb64ab0862be383ea5589864 100644
--- "a/data/2.MySQL\344\270\255\351\230\266/2. \346\237\245\350\257\242/6.UNION/union.json"	
+++ "b/data/2.MySQL\344\270\255\351\230\266/2. \346\237\245\350\257\242/6.UNION/union.json"	
@@ -3,5 +3,5 @@
   "author": "ccat",
   "source": "union.md",
   "notebook_enable": false,
-  "exercise_id": "331f369b150340f9989ccea8abfcd42f"
+  "exercise_id": "7c8ecf1329e64616a56e5def05d52c6c"
 }
\ No newline at end of file
diff --git "a/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/1.\350\247\206\345\233\276\347\232\204\345\237\272\346\234\254\346\246\202\345\277\265/config.json" "b/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/1.\350\247\206\345\233\276\347\232\204\345\237\272\346\234\254\346\246\202\345\277\265/config.json"
index ed1089c486fd6964077e50682cb4f4609d6b0017..47c1c42ddfc7ebc04bfc9f272801289bb3514b93 100644
--- "a/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/1.\350\247\206\345\233\276\347\232\204\345\237\272\346\234\254\346\246\202\345\277\265/config.json"
+++ "b/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/1.\350\247\206\345\233\276\347\232\204\345\237\272\346\234\254\346\246\202\345\277\265/config.json"
@@ -2,7 +2,9 @@
   "node_id": "mysql-95a29a6a448849029d548393bbdf283e",
   "keywords": [],
   "children": [],
-  "export": [],
+  "export": [
+    "view.json"
+  ],
   "keywords_must": [],
   "keywords_forbid": [],
   "group": 0
diff --git "a/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/1.\350\247\206\345\233\276\347\232\204\345\237\272\346\234\254\346\246\202\345\277\265/view.json" "b/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/1.\350\247\206\345\233\276\347\232\204\345\237\272\346\234\254\346\246\202\345\277\265/view.json"
new file mode 100644
index 0000000000000000000000000000000000000000..81f3e0164dc1a9e560fcd4688bafad84df5f0974
--- /dev/null
+++ "b/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/1.\350\247\206\345\233\276\347\232\204\345\237\272\346\234\254\346\246\202\345\277\265/view.json"
@@ -0,0 +1,7 @@
+{
+  "type": "code_options",
+  "author": "Mars Liu",
+  "source": "view.md",
+  "notebook_enable": false,
+  "exercise_id": "5335391d25d0428aa3dbe1759ac1ef37"
+}
\ No newline at end of file
diff --git "a/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/1.\350\247\206\345\233\276\347\232\204\345\237\272\346\234\254\346\246\202\345\277\265/view.md" "b/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/1.\350\247\206\345\233\276\347\232\204\345\237\272\346\234\254\346\246\202\345\277\265/view.md"
new file mode 100644
index 0000000000000000000000000000000000000000..153e40d106ee302ef340fac0dd06d764649541dc
--- /dev/null
+++ "b/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/1.\350\247\206\345\233\276\347\232\204\345\237\272\346\234\254\346\246\202\345\277\265/view.md"
@@ -0,0 +1,54 @@
+# 视图
+
+关于 MySQL 的视图，以下哪些说法是正确的？
+
+1. 视图可以看作预处理的查询
+2. 视图可以作为表用在查询中
+3. 包含主键的视图可以更新
+4. 与源数据满足一一对应关系的视图可以更新
+5. 包含列子查询的视图不能更新
+6. 包含 distinct 的视图不能更新
+7. 包含 union 或 union all 的视图不能更新
+8. 可以给用户授予指定视图的 show view 权限，以控制其访问
+
+## 答案
+
+所有都对
+
+## 选项
+
+### A
+
+所有都不对
+
+### B
+
+```
+1, 2, 3, 4, 5
+```
+
+### C
+
+```
+2, 3, 4, 5, 6, 7, 8
+```
+
+### D
+
+```
+1, 3, 5, 7
+```
+
+
+### E
+
+```
+5, 6, 7, 8
+```
+
+### F
+
+```
+4, 5, 7
+```
+
diff --git "a/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/2. \345\210\233\345\273\272\350\247\206\345\233\276/config.json" "b/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/2. \345\210\233\345\273\272\350\247\206\345\233\276/config.json"
index e11bcf9f5f2ffea27bfeb95a9db96bfc8bd5be51..7c4135a8298f2a4a316cc8ce51468b073fcda8ea 100644
--- "a/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/2. \345\210\233\345\273\272\350\247\206\345\233\276/config.json"	
+++ "b/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/2. \345\210\233\345\273\272\350\247\206\345\233\276/config.json"	
@@ -1,8 +1,12 @@
 {
   "node_id": "mysql-9339ebb389474492a0ba2c2ff29e78fb",
-  "keywords": ["create view"],
+  "keywords": [
+    "create view"
+  ],
   "children": [],
-  "export": [],
+  "export": [
+    "create_view.json"
+  ],
   "keywords_must": [],
   "keywords_forbid": [],
   "group": 0
diff --git "a/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/2. \345\210\233\345\273\272\350\247\206\345\233\276/create_view.json" "b/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/2. \345\210\233\345\273\272\350\247\206\345\233\276/create_view.json"
new file mode 100644
index 0000000000000000000000000000000000000000..710b185573c661c680a20e66d67a8fc67d37f67e
--- /dev/null
+++ "b/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/2. \345\210\233\345\273\272\350\247\206\345\233\276/create_view.json"	
@@ -0,0 +1,7 @@
+{
+  "type": "code_options",
+  "author": "Mars Liu",
+  "source": "create_view.md",
+  "notebook_enable": false,
+  "exercise_id": "990e457f98db463b9fe14831f6ab2afc"
+}
\ No newline at end of file
diff --git "a/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/2. \345\210\233\345\273\272\350\247\206\345\233\276/create_view.md" "b/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/2. \345\210\233\345\273\272\350\247\206\345\233\276/create_view.md"
new file mode 100644
index 0000000000000000000000000000000000000000..ecf523d828454befa54d056f479b1cc2e44a1275
--- /dev/null
+++ "b/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/2. \345\210\233\345\273\272\350\247\206\345\233\276/create_view.md"	
@@ -0,0 +1,71 @@
+# 创建视图
+
+Joe 想要基于 
+
+```mysql
+create table employee(
+    id int primary key auto_increment,
+    name varchar(256),
+    address varchar(1024),
+    dept varchar(64)
+    -- ignore more
+);
+
+create table customer(
+                         id int primary key auto_increment,
+                         name varchar(256),
+                         address varchar(1024),
+                         level int
+    -- ignore more
+)
+```
+
+创建视图 v_addresses，包含写姓名和地址两列。下列哪个正确？
+
+## 答案
+
+```mysql
+create view v_addresses as
+    select name, address from employee
+    union
+    select name, address from customer;
+```
+
+## 选项
+
+### A
+
+```mysql
+create view v_addresses as
+    select * from employee
+    union
+    select * from customer;
+```
+
+### B
+
+```mysql
+create view v_addresses as
+    select name, address from employee
+    union
+    select name, address from customer;
+```
+
+### C
+
+```mysql
+create view v_addresses as
+begin;
+    select name, address from employee
+    select name, address from customer;
+end;
+```
+
+### D
+
+```mysql
+create view v_addresses
+    select name, address from employee
+    union
+    select name, address from customer;
+```
diff --git "a/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/3. \344\277\256\346\224\271\350\247\206\345\233\276/alter_view.json" "b/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/3. \344\277\256\346\224\271\350\247\206\345\233\276/alter_view.json"
new file mode 100644
index 0000000000000000000000000000000000000000..1742f0fddeb0bf769582d8619c828cf530b82320
--- /dev/null
+++ "b/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/3. \344\277\256\346\224\271\350\247\206\345\233\276/alter_view.json"	
@@ -0,0 +1,7 @@
+{
+  "type": "code_options",
+  "author": "Mars Liu",
+  "source": "alter_view.md",
+  "notebook_enable": false,
+  "exercise_id": "a54d8dc829b64c78b63f3480af42e80e"
+}
\ No newline at end of file
diff --git "a/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/3. \344\277\256\346\224\271\350\247\206\345\233\276/alter_view.md" "b/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/3. \344\277\256\346\224\271\350\247\206\345\233\276/alter_view.md"
new file mode 100644
index 0000000000000000000000000000000000000000..6ec1ae1d3f7a51a672c255a7a15b726d888498fa
--- /dev/null
+++ "b/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/3. \344\277\256\346\224\271\350\247\206\345\233\276/alter_view.md"	
@@ -0,0 +1,76 @@
+# 修改视图
+
+针对用户表和员工表：
+
+```mysql
+create table employee(
+    id int primary key auto_increment,
+    name varchar(256),
+    address varchar(1024),
+    dept varchar(64)
+    -- ignore more
+);
+
+create table customer(
+                         id int primary key auto_increment,
+                         name varchar(256),
+                         address varchar(1024),
+                         level int
+    -- ignore more
+)
+```
+
+Joe 建立了联系人视图：
+
+```mysql
+create view v_contacts as
+    select name, address from employee
+    union
+    select name, address from customer;
+```
+
+现在，他想要加入一列 catalog ，区分员工和顾客，下面哪一个做法是错的？
+
+
+## 答案
+
+```mysql
+create if not exists view v_contacts as
+    select name, address, 'employee' as catalog from employee
+    union
+    select name, address, 'customer' as catalog from customer;
+```
+
+## 选项
+
+## A
+
+```mysql
+alter view v_contacts as
+    select name, address, 'employee' as catalog from employee
+    union
+    select name, address, 'customer' as catalog from customer;
+    
+```
+
+
+### B
+
+```mysql
+create or replace view v_contacts as
+    select name, address, 'employee' as catalog from employee
+    union
+    select name, address, 'customer' as catalog from customer;
+    
+```
+
+### C
+
+```mysql
+drop view v_contacts;
+create view v_contacts as
+    select name, address, 'employee' as catalog from employee
+    union
+    select name, address, 'customer' as catalog from customer;
+    
+```
\ No newline at end of file
diff --git "a/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/4. \344\277\256\346\224\271\350\247\206\345\233\276/config.json" "b/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/3. \344\277\256\346\224\271\350\247\206\345\233\276/config.json"
similarity index 78%
rename from "data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/4. \344\277\256\346\224\271\350\247\206\345\233\276/config.json"
rename to "data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/3. \344\277\256\346\224\271\350\247\206\345\233\276/config.json"
index a7bb70f2a8a0e02cad4e85ad12acdb3985e6894e..1b5a98319f2d1ec6dbf339bb7a3c95f55333ec2c 100644
--- "a/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/4. \344\277\256\346\224\271\350\247\206\345\233\276/config.json"	
+++ "b/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/3. \344\277\256\346\224\271\350\247\206\345\233\276/config.json"	
@@ -2,7 +2,9 @@
   "node_id": "mysql-3a51b0740b704d92a534335a7a8dfd6e",
   "keywords": [],
   "children": [],
-  "export": [],
+  "export": [
+    "alter_view.json"
+  ],
   "keywords_must": [],
   "keywords_forbid": [],
   "group": 0
diff --git "a/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/3.\347\211\251\345\214\226\350\247\206\345\233\276/config.json" "b/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/3.\347\211\251\345\214\226\350\247\206\345\233\276/config.json"
deleted file mode 100644
index 7111526574b7f6b26d2c68155814ad895d33734f..0000000000000000000000000000000000000000
--- "a/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/3.\347\211\251\345\214\226\350\247\206\345\233\276/config.json"
+++ /dev/null
@@ -1,9 +0,0 @@
-{
-  "node_id": "mysql-9e6db7d333c348c99d943774664792a7",
-  "keywords": [],
-  "children": [],
-  "export": [],
-  "keywords_must": [],
-  "keywords_forbid": [],
-  "group": 0
-}
\ No newline at end of file
diff --git "a/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/6. \345\210\240\351\231\244\350\247\206\345\233\276/config.json" "b/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/4. \345\210\240\351\231\244\350\247\206\345\233\276/config.json"
similarity index 78%
rename from "data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/6. \345\210\240\351\231\244\350\247\206\345\233\276/config.json"
rename to "data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/4. \345\210\240\351\231\244\350\247\206\345\233\276/config.json"
index 6ee254ca847408f4c28ceba9d274a89a3c458b5c..36974efaa6770638e6740e3d5f9e934e9584a9fd 100644
--- "a/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/6. \345\210\240\351\231\244\350\247\206\345\233\276/config.json"	
+++ "b/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/4. \345\210\240\351\231\244\350\247\206\345\233\276/config.json"	
@@ -2,7 +2,9 @@
   "node_id": "mysql-36171582b8324dc98ff16d9b0cac406d",
   "keywords": [],
   "children": [],
-  "export": [],
+  "export": [
+    "drop_view.json"
+  ],
   "keywords_must": [],
   "keywords_forbid": [],
   "group": 0
diff --git "a/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/4. \345\210\240\351\231\244\350\247\206\345\233\276/drop_view.json" "b/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/4. \345\210\240\351\231\244\350\247\206\345\233\276/drop_view.json"
new file mode 100644
index 0000000000000000000000000000000000000000..b34230aec54a007079c3cd5b886db35f7d2ca1ce
--- /dev/null
+++ "b/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/4. \345\210\240\351\231\244\350\247\206\345\233\276/drop_view.json"	
@@ -0,0 +1,7 @@
+{
+  "type": "code_options",
+  "author": "Mars Liu",
+  "source": "drop_view.md",
+  "notebook_enable": false,
+  "exercise_id": "3ef595b611414ae7957ffa93a91a5b99"
+}
\ No newline at end of file
diff --git "a/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/4. \345\210\240\351\231\244\350\247\206\345\233\276/drop_view.md" "b/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/4. \345\210\240\351\231\244\350\247\206\345\233\276/drop_view.md"
new file mode 100644
index 0000000000000000000000000000000000000000..993e87d12976beeb58953a9a50aa1921cbcbc8e7
--- /dev/null
+++ "b/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/4. \345\210\240\351\231\244\350\247\206\345\233\276/drop_view.md"	
@@ -0,0 +1,41 @@
+# 删除视图
+
+
+Joe 建立了联系人视图：
+
+```mysql
+create view v_contacts as
+    select name, address from employee
+    union
+    select name, address from customer;
+```
+
+现在，他完成了相关工作，想要删掉这个视图，应该执行哪个操作？
+
+
+## 答案
+
+```mysql
+drop view v_contacts;
+```
+
+## 选项
+
+## A
+
+```mysql
+delete from v_contacts;
+```
+
+
+### B
+
+```mysql
+delete from v_contacts where 1=1;
+```
+
+### C
+
+```mysql
+truncate table v_contacts;
+```
\ No newline at end of file
diff --git "a/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/5. \346\233\264\346\226\260\350\247\206\345\233\276\346\225\260\346\215\256/config.json" "b/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/5. \346\233\264\346\226\260\350\247\206\345\233\276\346\225\260\346\215\256/config.json"
deleted file mode 100644
index 75b7d1044cc789bce3cd5ccfeab25280d085ba95..0000000000000000000000000000000000000000
--- "a/data/2.MySQL\344\270\255\351\230\266/7.\350\247\206\345\233\276/5. \346\233\264\346\226\260\350\247\206\345\233\276\346\225\260\346\215\256/config.json"	
+++ /dev/null
@@ -1,9 +0,0 @@
-{
-  "node_id": "mysql-caf587fff11a43069351e61c98442dd1",
-  "keywords": ["update", "view"],
-  "children": [],
-  "export": [],
-  "keywords_must": [],
-  "keywords_forbid": [],
-  "group": 0
-}
\ No newline at end of file
diff --git "a/data/3.MySQL\351\253\230\351\230\266/3.SQL\351\253\230\347\272\247\346\212\200\345\267\247/4.Double Not Exists/DoubleNotExists.json" "b/data/3.MySQL\351\253\230\351\230\266/3.SQL\351\253\230\347\272\247\346\212\200\345\267\247/4.Double Not Exists/DoubleNotExists.json"
index 3712b3980b566431300c8f507ecda4f52f11489e..2ff42de6a7f95a72b9348138f95ddae436ecaaba 100644
--- "a/data/3.MySQL\351\253\230\351\230\266/3.SQL\351\253\230\347\272\247\346\212\200\345\267\247/4.Double Not Exists/DoubleNotExists.json"	
+++ "b/data/3.MySQL\351\253\230\351\230\266/3.SQL\351\253\230\347\272\247\346\212\200\345\267\247/4.Double Not Exists/DoubleNotExists.json"	
@@ -3,5 +3,5 @@
   "author": "Mars Liu",
   "source": "DoubleNotExists.md",
   "notebook_enable": false,
-  "exercise_id": "2fabb69f22224e48a26fec8911798ceb"
+  "exercise_id": "b9381a1d56da4de0862f5a8d3c7bb59a"
 }
\ No newline at end of file
diff --git a/data/tree.json b/data/tree.json
index fe512493837f47384bd6926d1da5a42b18263016..31955517f605435fe9a1f8075e419dc29cbccea1 100644
--- a/data/tree.json
+++ b/data/tree.json
@@ -509,7 +509,11 @@
                   {
                     "存储引擎": {
                       "node_id": "mysql-af89d54d66974111b4f67aeba2af7161",
-                      "keywords": [],
+                      "keywords": [
+                        "engine",
+                        "innodb",
+                        "myisam"
+                      ],
                       "children": [],
                       "keywords_must": [],
                       "keywords_forbid": []
@@ -582,7 +586,9 @@
                   {
                     "UNION": {
                       "node_id": "mysql-b57b6c08f5f240c6a997284e4448f088",
-                      "keywords": [],
+                      "keywords": [
+                        "union"
+                      ],
                       "children": [],
                       "keywords_must": [],
                       "keywords_forbid": []
@@ -923,15 +929,6 @@
                       "keywords_forbid": []
                     }
                   },
-                  {
-                    "物化视图": {
-                      "node_id": "mysql-9e6db7d333c348c99d943774664792a7",
-                      "keywords": [],
-                      "children": [],
-                      "keywords_must": [],
-                      "keywords_forbid": []
-                    }
-                  },
                   {
                     " 修改视图": {
                       "node_id": "mysql-3a51b0740b704d92a534335a7a8dfd6e",
@@ -941,18 +938,6 @@
                       "keywords_forbid": []
                     }
                   },
-                  {
-                    " 更新视图数据": {
-                      "node_id": "mysql-caf587fff11a43069351e61c98442dd1",
-                      "keywords": [
-                        "update",
-                        "view"
-                      ],
-                      "children": [],
-                      "keywords_must": [],
-                      "keywords_forbid": []
-                    }
-                  },
                   {
                     " 删除视图": {
                       "node_id": "mysql-36171582b8324dc98ff16d9b0cac406d",
@@ -1612,6 +1597,19 @@
                       "keywords_forbid": []
                     }
                   },
+                  {
+                    "Double Not Exists": {
+                      "node_id": "mysql-72761d60ad7c4a9a9c87435daca246b9",
+                      "keywords": [
+                        "exists",
+                        "not exists",
+                        "double not exists"
+                      ],
+                      "children": [],
+                      "keywords_must": [],
+                      "keywords_forbid": []
+                    }
+                  },
                   {
                     "写入和冲突": {
                       "node_id": "mysql-f9f2ae841cf14d079c8433c833d3396d",
@@ -1801,7 +1799,10 @@
                   {
                     "增加中间表": {
                       "node_id": "mysql-a2ddae1b044149ecbb74db3b6eb32721",
-                      "keywords": [],
+                      "keywords": [
+                        "middle",
+                        "中间表"
+                      ],
                       "children": [],
                       "keywords_must": [],
                       "keywords_forbid": []