add dml and commit exercise

data/2.OceanBase中阶/4.INSERT/config.json

 {
   "keywords": [],
   "node_id": "oceanbase-4d176da86e544f98acdb7b473d14902a",
-  "title": "INSERT"
+  "title": "INSERT",
+  "notebook_enable": false,
+  "export": ["insert.json"]
 }
\ No newline at end of file

data/2.OceanBase中阶/4.INSERT/insert.json

+{
+  "type": "code_options",
+  "author": "刘鑫",
+  "source": "insert.md"
+}
\ No newline at end of file

data/2.OceanBase中阶/4.INSERT/insert.md

+# Insert
+
+下列哪一个选项的插入语句有错误？
+
+## 答案
+
+```sql
+insert into cust set first_name = 'Mars', last_name = 'Liu', city = 'Tian Jin';
+```
+
+## 选项
+
+### 标准插入语句
+
+```sql
+insert into cust(first_name, last_name, city) values('Mars', 'Liu', 'Tian Jin');
+```
+
+### insert 可以使用 select 子句
+
+```sql
+insert into cust(first_name, last_name, city) select 'Mars', 'Liu', 'Tian Jin';
+```
+
+### insert 可以插入多条 values
+
+```sql
+insert into cust(first_name, last_name, city) 
+    values ('Mars', 'Liu', 'Tian Jin'), ('Milly', 'Lee', 'Tian Jin');
+```
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data/2.OceanBase中阶/5.UPDATE/config.json

 {
   "keywords": [],
   "node_id": "oceanbase-331c385ebc2448198f48564851555c06",
-  "title": "UPDATE"
+  "title": "UPDATE",
+  "notebook_enable": false,
+  "export": ["update.json"]
 }
\ No newline at end of file

data/2.OceanBase中阶/5.UPDATE/update.json

+{
+  "type": "code_options",
+  "author": "刘鑫",
+  "source": "update.md"
+}
\ No newline at end of file

data/2.OceanBase中阶/5.UPDATE/update.md

+# Update
+
+下面选项中，有错的是：
+
+## 答案
+
+```sql
+update cust(first_name) values('mars');
+```
+
+## 选项
+
+### 生产环境下不带 where 的update 通常是极度危险的，但是合法
+
+```sql
+update cust set first_name = 'Mars';
+```
+
+### 标准 sql
+
+```sql
+update cust set first_name='Mars' where id = 1234;
+```
+
+### Update 多个字段也是常用操作
+
+```sql
+update cust set first_name='Mars', last_name='Liu' where id = 1234;
+```
\ No newline at end of file

data/2.OceanBase中阶/6.DELETE/config.json

 {
   "keywords": [],
   "node_id": "oceanbase-704cfa03b69449b4bed5dc753bf5b7e7",
-  "title": "DELETE"
+  "title": "DELETE",
+  "export": "delete.json"
 }
\ No newline at end of file

data/2.OceanBase中阶/6.DELETE/delete.json

+{
+  "type": "code_options",
+  "author": "刘鑫",
+  "source": "delete.md"
+}
\ No newline at end of file

data/2.OceanBase中阶/6.DELETE/delete.md

+# Delete
+
+下列删除语句中，有错误的是：
+
+## 答案
+
+```sql
+delete from cust(id, last_name, first_name, city) where id = 5;
+```
+
+## 选项
+
+### 在生产环境不带 where 的 delete 是极度危险的操作，但是它仍然合法
+
+```sql
+delete from cust;
+```
+
+### 标准的删除操作
+
+```sql
+delete from cust where id=2341;
+```
+
+### 删除操作可以带有子查询
+
+```sql
+delete from cust where id in (select id from cust where city='Tian Jin');
+```
+

data/2.OceanBase中阶/7.REPLACE/config.json

 {
   "keywords": [],
   "node_id": "oceanbase-2884a0055c714346ba751c2f653e8445",
-  "title": "REPLACE"
+  "title": "REPLACE",
+  "export": ["replace.json"]
 }
\ No newline at end of file

data/2.OceanBase中阶/7.REPLACE/replace.json

+{
+  "type": "code_options",
+  "author": "刘鑫",
+  "source": "replace.md"
+}
\ No newline at end of file

data/2.OceanBase中阶/7.REPLACE/replace.md

+# Replace
+
+假设有数据表如下
+
+```sql
+create table cust(
+    id integer primary key ,
+    first_name varchar(256),
+    last_name varchar(256),
+    city varchar(256)
+);
+```
+
+下列replace语句中，有错误的是：
+
+## 答案
+
+```sql
+replace into cust(id) set first_name = 'Mars', last_name = 'Liu' where id = 6; 
+```
+
+## 选项
+
+### 标准的 replace
+
+```sql
+REPLACE INTO cust(id, first_name, last_name, city) values(1,'Mars', 'Liu', 'Tian Jin');
+```
+
+### 合法的插入操作
+
+```sql
+REPLACE INTO cust(first_name, last_name, city) values('Mars', 'Liu', 'Tian Jin');
+```
+
+### 合法的插入操作
+
+```sql
+REPLACE INTO cust(first_name, last_name, city)
+SELECT first_name, last_name, city FROM book;
+```
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data/2.OceanBase中阶/8.提交事务/config.json

 {
   "keywords": [],
   "node_id": "oceanbase-8526e5c5374b4081b9a5c698b9748856",
-  "title": "提交事务"
+  "title": "提交事务",
+  "export": "transaction.json"
 }
\ No newline at end of file

data/2.OceanBase中阶/8.提交事务/transaction.json

+{
+  "type": "code_options",
+  "author": "刘鑫",
+  "source": "transaction.md"
+}
\ No newline at end of file

data/2.OceanBase中阶/8.提交事务/transaction.md

+# Transaction
+
+下列选项中，哪个可以正确的保证 channel 表和 posts 表的同步修改？
+
+## 答案
+
+```sql
+begin;
+    insert into posts(title, content) select ?, ?;
+    update channel set posts = posts +1 where channel_id = ?;
+commit;
+```
+
+## 选项
+
+### 没有 commit
+
+```sql
+begin;
+    insert into posts(title, content) select ?, ?;
+    update channel set posts = posts +1 where channel_id = ?;
+end;
+```
+
+### 没有创建事务
+
+```sql
+insert into posts(title, content) select ?, ?;
+update channel set posts = posts +1 where channel_id = ?;
+commit;
+```
+
+### 多次提交
+
+```sql
+begin;
+    insert into posts(title, content) select ?, ?;
+commit;
+    update channel set posts = posts +1 where channel_id = ?;
+commit;
+```
\ No newline at end of file