diff --git "a/data/1.PostgreSQL\345\210\235\351\230\266/1.PostgreSQL\345\237\272\346\234\254\346\246\202\345\277\265/2.\346\234\215\345\212\241\345\231\250\345\222\214\345\256\242\346\210\267\347\253\257/server.json" "b/data/1.PostgreSQL\345\210\235\351\230\266/1.PostgreSQL\345\237\272\346\234\254\346\246\202\345\277\265/2.\346\234\215\345\212\241\345\231\250\345\222\214\345\256\242\346\210\267\347\253\257/server.json"
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..4a4cfd9f3f3533b8cdd0a7b9cb7543bb7ee0f84a 100644
--- "a/data/1.PostgreSQL\345\210\235\351\230\266/1.PostgreSQL\345\237\272\346\234\254\346\246\202\345\277\265/2.\346\234\215\345\212\241\345\231\250\345\222\214\345\256\242\346\210\267\347\253\257/server.json"
+++ "b/data/1.PostgreSQL\345\210\235\351\230\266/1.PostgreSQL\345\237\272\346\234\254\346\246\202\345\277\265/2.\346\234\215\345\212\241\345\231\250\345\222\214\345\256\242\346\210\267\347\253\257/server.json"
@@ -0,0 +1,7 @@
+{
+  "type": "code_options",
+  "author": "刘鑫",
+  "source": "server.md",
+  "notebook_enable": false,
+  "exercise_id": "88b033cd97c642ef9900e5e091e335ff"
+}
\ No newline at end of file
diff --git "a/data/1.PostgreSQL\345\210\235\351\230\266/2.PostgreSQL\347\232\204\345\256\211\350\243\205/3.\344\275\277\347\224\250PostgreSQL/develop.json" "b/data/1.PostgreSQL\345\210\235\351\230\266/2.PostgreSQL\347\232\204\345\256\211\350\243\205/3.\344\275\277\347\224\250PostgreSQL/develop.json"
index 2a13c11a1b2ef810fdcf3b16d03324449c20ec8c..3d1103ce048927a2d65afdadd048540e7007e7cb 100644
--- "a/data/1.PostgreSQL\345\210\235\351\230\266/2.PostgreSQL\347\232\204\345\256\211\350\243\205/3.\344\275\277\347\224\250PostgreSQL/develop.json"
+++ "b/data/1.PostgreSQL\345\210\235\351\230\266/2.PostgreSQL\347\232\204\345\256\211\350\243\205/3.\344\275\277\347\224\250PostgreSQL/develop.json"
@@ -2,5 +2,6 @@
   "type": "code_options",
   "author": "刘鑫",
   "source": "develop.md",
-  "notebook_enable": false
+  "notebook_enable": false,
+  "exercise_id": "257414ca11f24a35a6270166b6bd2830"
 }
\ No newline at end of file
diff --git "a/data/1.PostgreSQL\345\210\235\351\230\266/3.\346\237\245\350\257\242\346\225\260\346\215\256/1.SQL\345\237\272\346\234\254\350\257\255\346\263\225/basic.json" "b/data/1.PostgreSQL\345\210\235\351\230\266/3.\346\237\245\350\257\242\346\225\260\346\215\256/1.SQL\345\237\272\346\234\254\350\257\255\346\263\225/basic.json"
deleted file mode 100644
index 561a89f282404214c2e80b2615f2ceddd0c83e4e..0000000000000000000000000000000000000000
--- "a/data/1.PostgreSQL\345\210\235\351\230\266/3.\346\237\245\350\257\242\346\225\260\346\215\256/1.SQL\345\237\272\346\234\254\350\257\255\346\263\225/basic.json"
+++ /dev/null
@@ -1,6 +0,0 @@
-{
-  "type": "code_options",
-  "author": "刘鑫",
-  "source": "basic.md",
-  "notebook_enable": false
-}
\ No newline at end of file
diff --git "a/data/1.PostgreSQL\345\210\235\351\230\266/3.\346\237\245\350\257\242\346\225\260\346\215\256/1.SQL\345\237\272\346\234\254\350\257\255\346\263\225/basic.md" "b/data/1.PostgreSQL\345\210\235\351\230\266/3.\346\237\245\350\257\242\346\225\260\346\215\256/1.SQL\345\237\272\346\234\254\350\257\255\346\263\225/basic.md"
deleted file mode 100644
index 9d3b09c9474fa45ca8e771467d5a878b743f4a7a..0000000000000000000000000000000000000000
--- "a/data/1.PostgreSQL\345\210\235\351\230\266/3.\346\237\245\350\257\242\346\225\260\346\215\256/1.SQL\345\237\272\346\234\254\350\257\255\346\263\225/basic.md"
+++ /dev/null
@@ -1,43 +0,0 @@
-# 基本语法
-
-下列 SQL 语句，哪一项不合法？
-
-## 答案
-
-```postgresql
-from test select abc;
-```
-
-## 选项
-
-
-### A
-
-```postgresql
-select 3.14;
-```
-
-### B
-
-```postgresql
-select * from employee;
-```
-
-### C
-
-```postgresql
-select * from employee where dept = 'hr';
-```
-
-### D
-
-```postgresql
-select id, name, dept, salary from employee where salary > 10000::money;
-```
-
-### E
-
-```postgresql
-select now();
-```
-
diff --git "a/data/1.PostgreSQL\345\210\235\351\230\266/3.\346\237\245\350\257\242\346\225\260\346\215\256/1.SQL\345\237\272\346\234\254\350\257\255\346\263\225/config.json" "b/data/1.PostgreSQL\345\210\235\351\230\266/3.\346\237\245\350\257\242\346\225\260\346\215\256/1.SQL\345\237\272\346\234\254\350\257\255\346\263\225/config.json"
deleted file mode 100644
index 226c817f66f2bb58b646e1dabe17e16bd6c88abb..0000000000000000000000000000000000000000
--- "a/data/1.PostgreSQL\345\210\235\351\230\266/3.\346\237\245\350\257\242\346\225\260\346\215\256/1.SQL\345\237\272\346\234\254\350\257\255\346\263\225/config.json"
+++ /dev/null
@@ -1,6 +0,0 @@
-{
-  "node_id": "pg-dca8da7637f94ded91a1871daa51746e",
-  "keywords": ["语法", "select"],
-  "children": [],
-  "export": ["basic.json"]
-}
\ No newline at end of file
diff --git "a/data/1.PostgreSQL\345\210\235\351\230\266/3.\346\237\245\350\257\242\346\225\260\346\215\256/2.SQL\343\200\201DML\345\222\214DDL/concept.json" "b/data/1.PostgreSQL\345\210\235\351\230\266/3.\346\237\245\350\257\242\346\225\260\346\215\256/2.SQL\343\200\201DML\345\222\214DDL/concept.json"
deleted file mode 100644
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..0000000000000000000000000000000000000000
diff --git "a/data/1.PostgreSQL\345\210\235\351\230\266/3.\346\237\245\350\257\242\346\225\260\346\215\256/2.SQL\343\200\201DML\345\222\214DDL/concept.md" "b/data/1.PostgreSQL\345\210\235\351\230\266/3.\346\237\245\350\257\242\346\225\260\346\215\256/2.SQL\343\200\201DML\345\222\214DDL/concept.md"
deleted file mode 100644
index 66f30a9343dccc012227c7044e7888661b966df0..0000000000000000000000000000000000000000
--- "a/data/1.PostgreSQL\345\210\235\351\230\266/3.\346\237\245\350\257\242\346\225\260\346\215\256/2.SQL\343\200\201DML\345\222\214DDL/concept.md"
+++ /dev/null
@@ -1,31 +0,0 @@
-# 基本概念
-
-下列叙述中，正确的是
-
-1. 带有 select 关键字的查询不会修改数据
-2. 查询表需要 select 权限
-3. 修改一个数据库表或对象的结构，通常语句中会出现 create、add、drop、alter 等关键字
-4. 修改数据内容，通常会出现update、insert、delete等关键字
-5. update、insert、delete可以单独授权
-
-## 答案
-
-2, 3, 4, 5
-
-## 选项
-
-### A
-
-1, 2, 3, 4, 5
-
-### B
-
-4, 5
-
-### C
-
-1, 2, 3
-
-### D
-
-3, 4, 5
\ No newline at end of file
diff --git "a/data/1.PostgreSQL\345\210\235\351\230\266/3.\346\237\245\350\257\242\346\225\260\346\215\256/2.SQL\343\200\201DML\345\222\214DDL/config.json" "b/data/1.PostgreSQL\345\210\235\351\230\266/3.\346\237\245\350\257\242\346\225\260\346\215\256/2.SQL\343\200\201DML\345\222\214DDL/config.json"
deleted file mode 100644
index eff0052817986e37b26d08fef470adf94b76a6f9..0000000000000000000000000000000000000000
--- "a/data/1.PostgreSQL\345\210\235\351\230\266/3.\346\237\245\350\257\242\346\225\260\346\215\256/2.SQL\343\200\201DML\345\222\214DDL/config.json"
+++ /dev/null
@@ -1,11 +0,0 @@
-{
-  "node_id": "pg-b0f366abe12e41b0a9672d317e556662",
-  "keywords": ["DML", "insert", "update", "delete"],
-  "children": [],
-  "export": [
-    "insert.json",
-    "update.json",
-    "delete.json",
-    "concept.json"
-  ]
-}
\ No newline at end of file
diff --git "a/data/1.PostgreSQL\345\210\235\351\230\266/3.\346\237\245\350\257\242\346\225\260\346\215\256/2.SQL\343\200\201DML\345\222\214DDL/delete.json" "b/data/1.PostgreSQL\345\210\235\351\230\266/3.\346\237\245\350\257\242\346\225\260\346\215\256/2.SQL\343\200\201DML\345\222\214DDL/delete.json"
deleted file mode 100644
index 0d9b33f01824c9ef71aa2f0b0c54658fbafbf9eb..0000000000000000000000000000000000000000
--- "a/data/1.PostgreSQL\345\210\235\351\230\266/3.\346\237\245\350\257\242\346\225\260\346\215\256/2.SQL\343\200\201DML\345\222\214DDL/delete.json"
+++ /dev/null
@@ -1,7 +0,0 @@
-{
-  "type": "code_options",
-  "author": "刘鑫",
-  "source": "delete.md",
-  "notebook_enable": false,
-  "exercise_id": "78e6ca15ba794ef3b2092de4640308b9"
-}
\ No newline at end of file
diff --git "a/data/1.PostgreSQL\345\210\235\351\230\266/3.\346\237\245\350\257\242\346\225\260\346\215\256/2.SQL\343\200\201DML\345\222\214DDL/delete.md" "b/data/1.PostgreSQL\345\210\235\351\230\266/3.\346\237\245\350\257\242\346\225\260\346\215\256/2.SQL\343\200\201DML\345\222\214DDL/delete.md"
deleted file mode 100644
index 57f50db5d7288e926d8fb3883bbd90221a89325b..0000000000000000000000000000000000000000
--- "a/data/1.PostgreSQL\345\210\235\351\230\266/3.\346\237\245\350\257\242\346\225\260\346\215\256/2.SQL\343\200\201DML\345\222\214DDL/delete.md"
+++ /dev/null
@@ -1,89 +0,0 @@
-# 删除
-
-SmartMarket 公司的业务数据库中，有一个 orders 表，其结构主要是以下形态：
-
-```postgresql
-create table orders
-(
-    id         serial primary key,
-    meta       jsonb     default '{}'::jsonb,
-    content    jsonb     default '{}'::jsonb,
-    created_at timestamp default now(),
-    deal       boolean
-)
-```
-
-有一个业务系统会实时的将已经成交（deal 字段为 true）的订单数据转储，现在我们仅需要一个清理 程序，将已经成 交的数据从 orders 表删除并记录被删除的数据id。下面哪个操作是对的？
-
-## 答案
-
-在一个独立的定时任务中执行
-
-```postgresql
-delete
-from orders
-where deal
-returning id;
-```
-
-并记录id
-
-## 选项
-
-### A
-
-在一个独立的定时任务中执行
-
-```postgresql
-truncate orders;
-```
-
-### B
-
-在一个独立的定时任务中执行
-
-```postgresql
-delete
-from orders;
-```
-
-### C
-
-在一个独立的定时任务中执行
-
-```postgresql
-drop table orders;
-create table orders
-(
-    id         serial primary key,
-    meta       jsonb     default '{}'::jsonb,
-    content    jsonb     default '{}'::jsonb,
-    created_at timestamp default now(),
-    deal       boolean
-);
-```
-
-### D
-
-建立视图
-
-```postgresql
-create view order_view as
-select id, meta, content, created_at
-from orders
-where not deal;
-```
-
-并要求业务系统只能访问这个视图。
-
-### E
-
-在一个独立的定时任务中执行
-
-```postgresql
-delete
-from orders
-where deal;
-```
-
-并记录操作前后表中的最大 id
\ No newline at end of file
diff --git "a/data/1.PostgreSQL\345\210\235\351\230\266/3.\346\237\245\350\257\242\346\225\260\346\215\256/2.SQL\343\200\201DML\345\222\214DDL/insert.json" "b/data/1.PostgreSQL\345\210\235\351\230\266/3.\346\237\245\350\257\242\346\225\260\346\215\256/2.SQL\343\200\201DML\345\222\214DDL/insert.json"
deleted file mode 100644
index 9f3d239883717ce0f48abd10b8262662e39abb7e..0000000000000000000000000000000000000000
--- "a/data/1.PostgreSQL\345\210\235\351\230\266/3.\346\237\245\350\257\242\346\225\260\346\215\256/2.SQL\343\200\201DML\345\222\214DDL/insert.json"
+++ /dev/null
@@ -1,7 +0,0 @@
-{
-  "type": "code_options",
-  "author": "刘鑫",
-  "source": "insert.md",
-  "notebook_enable": false,
-  "exercise_id": "2d562e3ae4a84e648de31452a67ba71f"
-}
\ No newline at end of file
diff --git "a/data/1.PostgreSQL\345\210\235\351\230\266/3.\346\237\245\350\257\242\346\225\260\346\215\256/2.SQL\343\200\201DML\345\222\214DDL/insert.md" "b/data/1.PostgreSQL\345\210\235\351\230\266/3.\346\237\245\350\257\242\346\225\260\346\215\256/2.SQL\343\200\201DML\345\222\214DDL/insert.md"
deleted file mode 100644
index 60ea20f5d3abd384002c30460a24a4355b164de3..0000000000000000000000000000000000000000
--- "a/data/1.PostgreSQL\345\210\235\351\230\266/3.\346\237\245\350\257\242\346\225\260\346\215\256/2.SQL\343\200\201DML\345\222\214DDL/insert.md"
+++ /dev/null
@@ -1,55 +0,0 @@
-# 插入
-
-现有一个表：
-
-```postgresql
-create table book(
-    id serial primary key ,
-    title text not null ,
-    meta jsonb default '{}'::jsonb,
-    price money,
-    isbn text not null ,
-    publish_at date not null 
-);
-create unique index on book(isbn);
-create index on book using gin(meta);
-```
-
-那么下列哪个选项的代码可以执行成功？
-
-## 答案
-
-```postgresql
-insert into book(title, price, isbn, publish_at) select 'a book title', 25.4, 'xx-xxxx-xxxx', '2019-12-1'::date;
-insert into book(title, price, isbn, publish_at) select 'a other book title', 25.4, 'yy-yyyy-xxxx', '2019-12-1'::date; 
-```
-
-## 选项
-
-### 唯一键冲突
-
-```postgresql
-insert into book(title, price, isbn, publish_at) select 'a book title', 25.4, 'xx-xxxx-xxxx', '2019-12-1'::date;
-insert into book(title, price, isbn, publish_at) select 'a other book title', 35.4, 'xx-xxxx-xxxx', '2019-12-1'::date; 
-```
-
-### 缺少必要的列
-
-```postgresql
-insert into book(price, isbn, publish_at) select 25.4, 'xx-xxxx-xxxx', '2019-12-1'::date;
-insert into book(price, isbn, publish_at) select 35.4, 'yy-yyyy-xxxx', '2019-12-1'::date;
-```
-
-### 类型错误
-
-```postgresql
-insert into book(title, price, isbn, publish_at) select 'a book title', 'unknown', 'xx-xxxx-xxxx', '2019-12-1'::date;
-insert into book(title, price, isbn, publish_at) select 'a other book title', 'unknown', 'xx-xxxx-xxxx', '2019-12-1'::date;
-```
-
-### 违反非空约束
-
-```postgresql
-insert into book(title, price, isbn, publish_at) select null, 'unknown', 'xx-xxxx-xxxx', '2019-12-1'::date;
-insert into book(title, price, isbn, publish_at) select null, 'unknown', 'xx-xxxx-xxxx', '2019-12-1'::date;
-```
diff --git "a/data/1.PostgreSQL\345\210\235\351\230\266/3.\346\237\245\350\257\242\346\225\260\346\215\256/2.SQL\343\200\201DML\345\222\214DDL/update.json" "b/data/1.PostgreSQL\345\210\235\351\230\266/3.\346\237\245\350\257\242\346\225\260\346\215\256/2.SQL\343\200\201DML\345\222\214DDL/update.json"
deleted file mode 100644
index 3d5628ed786f0143539d426cfb2c402c0edeeebb..0000000000000000000000000000000000000000
--- "a/data/1.PostgreSQL\345\210\235\351\230\266/3.\346\237\245\350\257\242\346\225\260\346\215\256/2.SQL\343\200\201DML\345\222\214DDL/update.json"
+++ /dev/null
@@ -1,7 +0,0 @@
-{
-  "type": "code_options",
-  "author": "刘鑫",
-  "source": "update.md",
-  "notebook_enable": false,
-  "exercise_id": "d6f2c270c3cd41a499715e55a2c565ba"
-}
\ No newline at end of file
diff --git "a/data/1.PostgreSQL\345\210\235\351\230\266/3.\346\237\245\350\257\242\346\225\260\346\215\256/2.SQL\343\200\201DML\345\222\214DDL/update.md" "b/data/1.PostgreSQL\345\210\235\351\230\266/3.\346\237\245\350\257\242\346\225\260\346\215\256/2.SQL\343\200\201DML\345\222\214DDL/update.md"
deleted file mode 100644
index c4b998f04833a537decef6b71a152cd666991b96..0000000000000000000000000000000000000000
--- "a/data/1.PostgreSQL\345\210\235\351\230\266/3.\346\237\245\350\257\242\346\225\260\346\215\256/2.SQL\343\200\201DML\345\222\214DDL/update.md"
+++ /dev/null
@@ -1,49 +0,0 @@
-# 更新数据
-
-现有 employee 表如下：
-
-```postgresql
-create table employee
-(
-    id serial primary key,
-    name text,
-    dept text,
-    salary money
-);
-```
-
-我们希望修改销售部(dept 字段为 sale)员工 Dora Muk 的工资，将其增加 1000，返回她的工号。正确的修改语句是：
-
-## 答案
-
-```postgresql
-update employee set salary = salary + 1000 where dept = 'sale' and name = 'Dora Muk' returning id;
-```
-
-## 选项
-
-### 过滤条件不严谨
-
-```postgresql
-update employee set salary = salary + 1000 where name = 'Dora Muk' returning id;
-```
-
-### 没有返回员工id
-
-```postgresql
-update employee set salary = salary + 1000 where dept = 'sale' and name = 'Dora Muk';
-```
-
-
-### 缺少过滤条件
-
-```postgresql
-update employee set salary = salary + 1000 returning id;
-```
-
-### 错误的赋值语句
-
-```postgresql
-update employee set salary += 1000 returning id;
-```
-
diff --git "a/data/2.PostgreSQL\344\270\255\351\230\266/2.\346\234\215\345\212\241\347\253\257\347\274\226\347\250\213/3.\345\255\220\346\237\245\350\257\242/subquery.json" "b/data/2.PostgreSQL\344\270\255\351\230\266/2.\346\234\215\345\212\241\347\253\257\347\274\226\347\250\213/3.\345\255\220\346\237\245\350\257\242/subquery.json"
index 9b14469b05c64a3a724233dcd5393cd717e71fd4..1e8e1153ebe6b6d275feb24821124f67e3b16a82 100644
--- "a/data/2.PostgreSQL\344\270\255\351\230\266/2.\346\234\215\345\212\241\347\253\257\347\274\226\347\250\213/3.\345\255\220\346\237\245\350\257\242/subquery.json"
+++ "b/data/2.PostgreSQL\344\270\255\351\230\266/2.\346\234\215\345\212\241\347\253\257\347\274\226\347\250\213/3.\345\255\220\346\237\245\350\257\242/subquery.json"
@@ -2,5 +2,6 @@
   "type": "code_options",
   "author": "刘鑫",
   "source": "subquery.md",
-  "notebook_enable": false
+  "notebook_enable": false,
+  "exercise_id": "82be2aa951304dc9869cd7177fcba99f"
 }
\ No newline at end of file
diff --git "a/data/2.PostgreSQL\344\270\255\351\230\266/2.\346\234\215\345\212\241\347\253\257\347\274\226\347\250\213/7.\350\277\207\347\250\213\345\214\226\347\274\226\347\250\213/config.json" "b/data/2.PostgreSQL\344\270\255\351\230\266/2.\346\234\215\345\212\241\347\253\257\347\274\226\347\250\213/7.\350\277\207\347\250\213\345\214\226\347\274\226\347\250\213/config.json"
deleted file mode 100644
index 4158705eeb68bc8d607426b67357aa6e503ae6e1..0000000000000000000000000000000000000000
--- "a/data/2.PostgreSQL\344\270\255\351\230\266/2.\346\234\215\345\212\241\347\253\257\347\274\226\347\250\213/7.\350\277\207\347\250\213\345\214\226\347\274\226\347\250\213/config.json"
+++ /dev/null
@@ -1,6 +0,0 @@
-{
-  "node_id": "pg-eb4048b7dfd3469f8049330ba78427b5",
-  "keywords": [],
-  "children": [],
-  "export": ["loop.json"]
-}
\ No newline at end of file
diff --git "a/data/2.PostgreSQL\344\270\255\351\230\266/2.\346\234\215\345\212\241\347\253\257\347\274\226\347\250\213/7.\350\277\207\347\250\213\345\214\226\347\274\226\347\250\213/loop.json" "b/data/2.PostgreSQL\344\270\255\351\230\266/2.\346\234\215\345\212\241\347\253\257\347\274\226\347\250\213/7.\350\277\207\347\250\213\345\214\226\347\274\226\347\250\213/loop.json"
deleted file mode 100644
index 2cdec7a77920404dd9858003d6b7e692ab4e2e7d..0000000000000000000000000000000000000000
--- "a/data/2.PostgreSQL\344\270\255\351\230\266/2.\346\234\215\345\212\241\347\253\257\347\274\226\347\250\213/7.\350\277\207\347\250\213\345\214\226\347\274\226\347\250\213/loop.json"
+++ /dev/null
@@ -1,6 +0,0 @@
-{
-  "type": "code_options",
-  "author": "刘鑫",
-  "source": "loop.md",
-  "notebook_enable": false
-}
\ No newline at end of file
diff --git "a/data/2.PostgreSQL\344\270\255\351\230\266/2.\346\234\215\345\212\241\347\253\257\347\274\226\347\250\213/7.\350\277\207\347\250\213\345\214\226\347\274\226\347\250\213/loop.md" "b/data/2.PostgreSQL\344\270\255\351\230\266/2.\346\234\215\345\212\241\347\253\257\347\274\226\347\250\213/7.\350\277\207\347\250\213\345\214\226\347\274\226\347\250\213/loop.md"
deleted file mode 100644
index 83b52303dff3cc20de0d1f917a2aec1b30eec33d..0000000000000000000000000000000000000000
--- "a/data/2.PostgreSQL\344\270\255\351\230\266/2.\346\234\215\345\212\241\347\253\257\347\274\226\347\250\213/7.\350\277\207\347\250\213\345\214\226\347\274\226\347\250\213/loop.md"
+++ /dev/null
@@ -1,66 +0,0 @@
-# 循环
-
-下面哪一项定义的函数可以生成指定范围内的整数数列？
-
-## 答案
-
-```postgresql
-create function gen(start integer, stop integer) returns setof integer as $$
-begin 
-    for idx in start .. stop loop
-        return next idx;
-    end loop;
-end;
-$$ language plpgsql;
-```
-
-## 选项
-
-### A
-
-```postgresql
-create function gen(start integer, stop integer) returns integer as $$
-begin 
-    for idx in start .. stop loop
-        return idx;
-    end loop;
-end;
-$$ language plpgsql;
-```
-
-### B
-
-```postgresql
-create function gen(start integer, stop integer) returns integer as $$
-begin 
-    for idx in start .. stop loop
-        yield idx;
-    end loop;
-end;
-$$ language plpgsql;
-```
-
-### C
-
-```postgresql
-create function gen(start integer, stop integer) returns setof integer as $$
-begin 
-    for idx in start .. stop loop
-        return idx;
-        idx += 1;
-    end loop;
-end;
-$$ language plpgsql;
-```
-
-### D
-
-```postgresql
-create function gen(start integer, stop integer) returns setof integer as $$
-begin 
-    for idx in start .. stop loop
-        select idx;
-    end loop ;
-end;
-$$ language plpgsql;
-```
\ No newline at end of file
diff --git "a/data/2.PostgreSQL\344\270\255\351\230\266/2.\346\234\215\345\212\241\347\253\257\347\274\226\347\250\213/8.DDL/config.json" "b/data/2.PostgreSQL\344\270\255\351\230\266/2.\346\234\215\345\212\241\347\253\257\347\274\226\347\250\213/8.DDL/config.json"
deleted file mode 100644
index 0fc750a98ac0baa796dc77125b92260a3c1dbd85..0000000000000000000000000000000000000000
--- "a/data/2.PostgreSQL\344\270\255\351\230\266/2.\346\234\215\345\212\241\347\253\257\347\274\226\347\250\213/8.DDL/config.json"
+++ /dev/null
@@ -1,6 +0,0 @@
-{
-  "node_id": "pg-0378bcd60ccd4dfebcfead92abbdd673",
-  "keywords": [],
-  "children": [],
-  "export": []
-}
\ No newline at end of file
diff --git "a/data/3.PostgreSQL\351\253\230\351\230\266/2.\351\253\230\347\272\247\346\225\260\346\215\256\347\261\273\345\236\213/2.\345\207\240\344\275\225\347\261\273\345\236\213\345\222\214GIS/config.json" "b/data/3.PostgreSQL\351\253\230\351\230\266/2.\351\253\230\347\272\247\346\225\260\346\215\256\347\261\273\345\236\213/2.\345\207\240\344\275\225\347\261\273\345\236\213\345\222\214GIS/config.json"
deleted file mode 100644
index b99d8b54997bf034899150b1cce368a47da36d3a..0000000000000000000000000000000000000000
--- "a/data/3.PostgreSQL\351\253\230\351\230\266/2.\351\253\230\347\272\247\346\225\260\346\215\256\347\261\273\345\236\213/2.\345\207\240\344\275\225\347\261\273\345\236\213\345\222\214GIS/config.json"
+++ /dev/null
@@ -1,6 +0,0 @@
-{
-  "node_id": "pg-3bbe12c0a19d4cb7a61dc0a20624ed89",
-  "keywords": [],
-  "children": [],
-  "export": []
-}
\ No newline at end of file
diff --git "a/data/3.PostgreSQL\351\253\230\351\230\266/2.\351\253\230\347\272\247\346\225\260\346\215\256\347\261\273\345\236\213/3.JSON\345\222\214JSONB/config.json" "b/data/3.PostgreSQL\351\253\230\351\230\266/2.\351\253\230\347\272\247\346\225\260\346\215\256\347\261\273\345\236\213/3.JSON\345\222\214JSONB/config.json"
deleted file mode 100644
index a53d11583eb90dd54559fd0896373565e0c8dd56..0000000000000000000000000000000000000000
--- "a/data/3.PostgreSQL\351\253\230\351\230\266/2.\351\253\230\347\272\247\346\225\260\346\215\256\347\261\273\345\236\213/3.JSON\345\222\214JSONB/config.json"
+++ /dev/null
@@ -1,6 +0,0 @@
-{
-  "node_id": "pg-69ad784e39c044d7a115cfd124e49ef1",
-  "keywords": [],
-  "children": [],
-  "export": []
-}
\ No newline at end of file
diff --git "a/data/3.PostgreSQL\351\253\230\351\230\266/2.\351\253\230\347\272\247\346\225\260\346\215\256\347\261\273\345\236\213/3.JSON\345\222\214JSONB/json.json" "b/data/3.PostgreSQL\351\253\230\351\230\266/2.\351\253\230\347\272\247\346\225\260\346\215\256\347\261\273\345\236\213/3.JSON\345\222\214JSONB/json.json"
deleted file mode 100644
index 5ef2622a00282644015139dee5887ee560448162..0000000000000000000000000000000000000000
--- "a/data/3.PostgreSQL\351\253\230\351\230\266/2.\351\253\230\347\272\247\346\225\260\346\215\256\347\261\273\345\236\213/3.JSON\345\222\214JSONB/json.json"
+++ /dev/null
@@ -1,6 +0,0 @@
-{
-  "type": "code_options",
-  "author": "刘鑫",
-  "source": "json.md",
-  "notebook_enable": false
-}
\ No newline at end of file
diff --git "a/data/3.PostgreSQL\351\253\230\351\230\266/2.\351\253\230\347\272\247\346\225\260\346\215\256\347\261\273\345\236\213/3.JSON\345\222\214JSONB/json.md" "b/data/3.PostgreSQL\351\253\230\351\230\266/2.\351\253\230\347\272\247\346\225\260\346\215\256\347\261\273\345\236\213/3.JSON\345\222\214JSONB/json.md"
deleted file mode 100644
index f6daaf1ca691f186d9a39b7c660b328c8f6fae04..0000000000000000000000000000000000000000
--- "a/data/3.PostgreSQL\351\253\230\351\230\266/2.\351\253\230\347\272\247\346\225\260\346\215\256\347\261\273\345\236\213/3.JSON\345\222\214JSONB/json.md"
+++ /dev/null
@@ -1,31 +0,0 @@
-# JSON 和 JSONB 类型
-
-关于 JSON 和 JSONB 类型，哪句话是错的？
-
-## 答案
-
-JSON 就是 文本类型的封装，JSONB 是 JSON 的二进制压缩格式，JSON 和 JSONB 的功能与 TEXT 类型一样。
-
-## 选项
-
-### A
-
-JSONB 是推荐的 JSON 字段类型，更为高效。
-
-### B
-
-JSONB 可以通过 GIST 倒排索引优化对内部结构的查询。
-
-
-### C
-
-PostgreSQL JSON 和 JSONB 支持 JSON PATH表达式
-
-### D
-
-JSONB 和 文本可以有效兼容
-
-### E
-
-JSON 和 JSONB 与其它类型一样，不能部分修改，只能作为整体插入或更新
-
diff --git "a/data/3.PostgreSQL\351\253\230\351\230\266/2.\351\253\230\347\272\247\346\225\260\346\215\256\347\261\273\345\236\213/3.JSON\345\222\214JSONB/match.json" "b/data/3.PostgreSQL\351\253\230\351\230\266/2.\351\253\230\347\272\247\346\225\260\346\215\256\347\261\273\345\236\213/3.JSON\345\222\214JSONB/match.json"
deleted file mode 100644
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..0000000000000000000000000000000000000000
diff --git "a/data/3.PostgreSQL\351\253\230\351\230\266/2.\351\253\230\347\272\247\346\225\260\346\215\256\347\261\273\345\236\213/3.JSON\345\222\214JSONB/match.md" "b/data/3.PostgreSQL\351\253\230\351\230\266/2.\351\253\230\347\272\247\346\225\260\346\215\256\347\261\273\345\236\213/3.JSON\345\222\214JSONB/match.md"
deleted file mode 100644
index a51534d433d9af72138b8e8f522a1f89f8d17cf9..0000000000000000000000000000000000000000
--- "a/data/3.PostgreSQL\351\253\230\351\230\266/2.\351\253\230\347\272\247\346\225\260\346\215\256\347\261\273\345\236\213/3.JSON\345\222\214JSONB/match.md"
+++ /dev/null
@@ -1,56 +0,0 @@
-# 匹配
-
-表 book 的 meta 有类似如下结构：
-
-```json
-{
-  "author": [
-    "Mars Liu",
-    "Milly Lee"
-  ],
-  "ISBN": "xxxx-xxxx-xxxxxx",
-  "version": 1
-}
-```
-
-该字段有 gist 索引。
-
-如果我们想高效率的找到所有作者包含 Jim Gray 的书，应该如何查询？
-
-## 答案
-
-```postgresql
-select * from book where meta @> '{"author": ["Jim Gray"]}'::jsonb;
-```
-
-## 选项
-
-### A
-
-```postgresql
-select * from book where meta @> '["Jim Gray"]'::jsonb;
-```
-
-### A
-
-```postgresql
-select * from book where 'Jim Gray' in meta;
-```
-
-### B
-
-```postgresql
-select * from book where meta::text like '%Jim Gray%'; 
-```
-
-### C
-
-```postgresql
-select * from book having meta @> 'Jim Gray'
-```
-
-### D
-
-```postgresql
-select * from book where 'Jim Gray' in (meta #>> 'author');
-```
diff --git "a/data/3.PostgreSQL\351\253\230\351\230\266/2.\351\253\230\347\272\247\346\225\260\346\215\256\347\261\273\345\236\213/3.JSON\345\222\214JSONB/tags.json" "b/data/3.PostgreSQL\351\253\230\351\230\266/2.\351\253\230\347\272\247\346\225\260\346\215\256\347\261\273\345\236\213/3.JSON\345\222\214JSONB/tags.json"
deleted file mode 100644
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..0000000000000000000000000000000000000000
diff --git "a/data/3.PostgreSQL\351\253\230\351\230\266/2.\351\253\230\347\272\247\346\225\260\346\215\256\347\261\273\345\236\213/3.JSON\345\222\214JSONB/tags.md" "b/data/3.PostgreSQL\351\253\230\351\230\266/2.\351\253\230\347\272\247\346\225\260\346\215\256\347\261\273\345\236\213/3.JSON\345\222\214JSONB/tags.md"
deleted file mode 100644
index b15550792a7f463effc4fd4875b976e10650c575..0000000000000000000000000000000000000000
--- "a/data/3.PostgreSQL\351\253\230\351\230\266/2.\351\253\230\347\272\247\346\225\260\346\215\256\347\261\273\345\236\213/3.JSON\345\222\214JSONB/tags.md"
+++ /dev/null
@@ -1,46 +0,0 @@
-# 标签
-
-现有一个表 sku:
-
-```postgresql
-create table sku(
-    id serial primary key ,
-    name text,
-    meta jsonb default '{}'::jsonb,
-    tags jsonb default '[]'::jsonb
-)
-```
-
-我们希望查找包含所有给定tag的商品，那么查询应该是：
-
-## 答案
-
-```postgresql
-select id, name, meta, tags from sku where tags @> $1;
-```
-
-## 选项
-
-### A
-
-```postgresql
-select id, name, meta, tags from sku where tags = $1;
-```
-
-### B
-
-```postgresql
-select id, name, meta, tags from sku where tags::text = $1;
-```
-
-### C
-
-```postgresql
-select id, name, meta, tags from sku where $1 in tags;
-```
-
-### D
-
-```postgresql
-select id, name, meta, tags from sku where tags in $1;
-```
diff --git "a/data/3.PostgreSQL\351\253\230\351\230\266/2.\351\253\230\347\272\247\346\225\260\346\215\256\347\261\273\345\236\213/4.\345\207\275\346\225\260/config.json" "b/data/3.PostgreSQL\351\253\230\351\230\266/2.\351\253\230\347\272\247\346\225\260\346\215\256\347\261\273\345\236\213/4.\345\207\275\346\225\260/config.json"
deleted file mode 100644
index 6268b0be48ff42b024e48ffe56d4845578c665f2..0000000000000000000000000000000000000000
--- "a/data/3.PostgreSQL\351\253\230\351\230\266/2.\351\253\230\347\272\247\346\225\260\346\215\256\347\261\273\345\236\213/4.\345\207\275\346\225\260/config.json"
+++ /dev/null
@@ -1,6 +0,0 @@
-{
-  "node_id": "pg-6dbbb44b41d347b58075a9155dfb8356",
-  "keywords": [],
-  "children": [],
-  "export": []
-}
\ No newline at end of file
diff --git "a/data/3.PostgreSQL\351\253\230\351\230\266/2.\351\253\230\347\272\247\346\225\260\346\215\256\347\261\273\345\236\213/4.\345\207\275\346\225\260/distinct.json" "b/data/3.PostgreSQL\351\253\230\351\230\266/2.\351\253\230\347\272\247\346\225\260\346\215\256\347\261\273\345\236\213/4.\345\207\275\346\225\260/distinct.json"
deleted file mode 100644
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..0000000000000000000000000000000000000000
diff --git "a/data/3.PostgreSQL\351\253\230\351\230\266/2.\351\253\230\347\272\247\346\225\260\346\215\256\347\261\273\345\236\213/4.\345\207\275\346\225\260/distinct.md" "b/data/3.PostgreSQL\351\253\230\351\230\266/2.\351\253\230\347\272\247\346\225\260\346\215\256\347\261\273\345\236\213/4.\345\207\275\346\225\260/distinct.md"
deleted file mode 100644
index 0e661f628f3ede3e4cfa8bc04c6631dcf87f0966..0000000000000000000000000000000000000000
--- "a/data/3.PostgreSQL\351\253\230\351\230\266/2.\351\253\230\347\272\247\346\225\260\346\215\256\347\261\273\345\236\213/4.\345\207\275\346\225\260/distinct.md"
+++ /dev/null
@@ -1,46 +0,0 @@
-# 去重
-
-下列函数中，有一个实现了合并两个 jsonb 对象并对其去重，是哪一项？
-
-## 答案
-
-```postgresql
-create function jsonb_distinct_merge(a jsonb, b jsonb) returns jsonb as
-$$
-    select jsonb_agg(distinct (value)) from jsonb_array_elements(a || b)
-$$ language sql
-```
-
-## 选项
-
-### A
-
-```postgresql
-create function jsonb_distinct_merge(a jsonb, b jsonb) returns jsonb as $$
-    select a || b
-$$ language sql
-```
-
-### B
-
-```postgresql
-create function jsonb_distinct_merge(a jsonb, b jsonb) returns jsonb as $$
-return jsonb_agg(distinct(value)) from jsonb_array_elements(a||b)
-$$ language sql
-```
-
-### C
-
-```postgresql
-create function jsonb_distinct_merge(a jsonb, b jsonb) returns jsonb as $$
-    return next jsonb_agg(distinct(value)) from jsonb_array_elements(a||b)
-$$ language sql
-```
-
-### D
-
-```postgresql
-create function jsonb_distinct_merge(a jsonb, b jsonb) returns jsonb as $$
-    select a + b;
-$$ language sql
-```
\ No newline at end of file
diff --git "a/data/3.PostgreSQL\351\253\230\351\230\266/2.\351\253\230\347\272\247\346\225\260\346\215\256\347\261\273\345\236\213/5.\350\247\206\345\233\276/config.json" "b/data/3.PostgreSQL\351\253\230\351\230\266/2.\351\253\230\347\272\247\346\225\260\346\215\256\347\261\273\345\236\213/5.\350\247\206\345\233\276/config.json"
deleted file mode 100644
index 5c230df395d3d6b1344791637c0a74e015a3d337..0000000000000000000000000000000000000000
--- "a/data/3.PostgreSQL\351\253\230\351\230\266/2.\351\253\230\347\272\247\346\225\260\346\215\256\347\261\273\345\236\213/5.\350\247\206\345\233\276/config.json"
+++ /dev/null
@@ -1,6 +0,0 @@
-{
-  "node_id": "pg-532f8f84ea74493a9581e6bf720ebf78",
-  "keywords": [],
-  "children": [],
-  "export": []
-}
\ No newline at end of file
diff --git "a/data/3.PostgreSQL\351\253\230\351\230\266/2.\351\253\230\347\272\247\346\225\260\346\215\256\347\261\273\345\236\213/5.\350\247\206\345\233\276/view.json" "b/data/3.PostgreSQL\351\253\230\351\230\266/2.\351\253\230\347\272\247\346\225\260\346\215\256\347\261\273\345\236\213/5.\350\247\206\345\233\276/view.json"
deleted file mode 100644
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..0000000000000000000000000000000000000000
diff --git "a/data/3.PostgreSQL\351\253\230\351\230\266/2.\351\253\230\347\272\247\346\225\260\346\215\256\347\261\273\345\236\213/5.\350\247\206\345\233\276/view.md" "b/data/3.PostgreSQL\351\253\230\351\230\266/2.\351\253\230\347\272\247\346\225\260\346\215\256\347\261\273\345\236\213/5.\350\247\206\345\233\276/view.md"
deleted file mode 100644
index 9d4c2f407b2fc568407dac67abc2f540c0f80700..0000000000000000000000000000000000000000
--- "a/data/3.PostgreSQL\351\253\230\351\230\266/2.\351\253\230\347\272\247\346\225\260\346\215\256\347\261\273\345\236\213/5.\350\247\206\345\233\276/view.md"
+++ /dev/null
@@ -1,30 +0,0 @@
-# 视图
-
-SmartMarket 公司的数据分析师，每天要执行一个固定的复杂查询，生成每日报表。我们准备将其创建为视图，这能够解决：
-
-1. 简化查询
-2. 降低查询时死锁的风险
-3. 大幅优化查询性能
-4. 限制权限
-
-## 答案
-
-1, 4
-
-## 选项
-
-### A
-
-1. 2, 3, 4
-
-### B
-
-1, 2, 3
-
-### C
-
-2, 3
-
-### D
-
-3, 4
\ No newline at end of file
diff --git "a/data/3.PostgreSQL\351\253\230\351\230\266/3.SQL\351\253\230\347\272\247\346\212\200\345\267\247/2.\351\200\217\350\247\206\350\241\250 /pivot.json" "b/data/3.PostgreSQL\351\253\230\351\230\266/3.SQL\351\253\230\347\272\247\346\212\200\345\267\247/2.\351\200\217\350\247\206\350\241\250 /pivot.json"
index e69de29bb2d1d6434b8b29ae775ad8c2e48c5391..824979b9801b31371adee1b75e10c23b50dee42a 100644
--- "a/data/3.PostgreSQL\351\253\230\351\230\266/3.SQL\351\253\230\347\272\247\346\212\200\345\267\247/2.\351\200\217\350\247\206\350\241\250 /pivot.json"	
+++ "b/data/3.PostgreSQL\351\253\230\351\230\266/3.SQL\351\253\230\347\272\247\346\212\200\345\267\247/2.\351\200\217\350\247\206\350\241\250 /pivot.json"	
@@ -0,0 +1,7 @@
+{
+  "type": "code_options",
+  "author": "刘鑫",
+  "source": "pivot.md",
+  "notebook_enable": false,
+  "exercise_id": "88b033cd97c642ef9900e5e091e335ff"
+}
\ No newline at end of file
diff --git "a/data/3.PostgreSQL\351\253\230\351\230\266/3.SQL\351\253\230\347\272\247\346\212\200\345\267\247/3.\345\206\231\345\205\245\345\222\214\345\206\262\347\252\201/score.json" "b/data/3.PostgreSQL\351\253\230\351\230\266/3.SQL\351\253\230\347\272\247\346\212\200\345\267\247/3.\345\206\231\345\205\245\345\222\214\345\206\262\347\252\201/score.json"
index c322b0d1ec6f003760a96e0650df3415df61f28b..2c8ce8ccaede491b5346463a2666f497a36b1ee9 100644
--- "a/data/3.PostgreSQL\351\253\230\351\230\266/3.SQL\351\253\230\347\272\247\346\212\200\345\267\247/3.\345\206\231\345\205\245\345\222\214\345\206\262\347\252\201/score.json"
+++ "b/data/3.PostgreSQL\351\253\230\351\230\266/3.SQL\351\253\230\347\272\247\346\212\200\345\267\247/3.\345\206\231\345\205\245\345\222\214\345\206\262\347\252\201/score.json"
@@ -2,5 +2,6 @@
   "type": "code_options",
   "author": "刘鑫",
   "source": "score.md",
-  "notebook_enable": false
+  "notebook_enable": false,
+  "exercise_id": "a4ef62fde91d4f558c6107172ba4f736"
 }
\ No newline at end of file
diff --git "a/data/3.PostgreSQL\351\253\230\351\230\266/3.SQL\351\253\230\347\272\247\346\212\200\345\267\247/4.\344\272\213\345\212\241/transaction.json" "b/data/3.PostgreSQL\351\253\230\351\230\266/3.SQL\351\253\230\347\272\247\346\212\200\345\267\247/4.\344\272\213\345\212\241/transaction.json"
index 7309b3a0e6183dce5c509d90fb7eaa95a31d7c8f..4c56609d4d193007b0e35d17b793ec0193c77d08 100644
--- "a/data/3.PostgreSQL\351\253\230\351\230\266/3.SQL\351\253\230\347\272\247\346\212\200\345\267\247/4.\344\272\213\345\212\241/transaction.json"
+++ "b/data/3.PostgreSQL\351\253\230\351\230\266/3.SQL\351\253\230\347\272\247\346\212\200\345\267\247/4.\344\272\213\345\212\241/transaction.json"
@@ -2,5 +2,6 @@
   "type": "code_options",
   "author": "刘鑫",
   "source": "transaction.md",
-  "notebook_enable": false
+  "notebook_enable": false,
+  "exercise_id": "bce8976b508942bdbe3bd5b6315e7583"
 }
\ No newline at end of file
diff --git a/data/tree.json b/data/tree.json
index 2c531f4c1403f30a1b182d83180db7762052c24a..0919968dab870f481e6caae74275b7600dbdfc8f 100644
--- a/data/tree.json
+++ b/data/tree.json
@@ -1,28 +1,28 @@
 {
   "pg": {
-    "node_id": "pg-4544619de2a54841930282c700ba92b8",
+    "node_id": "pg-d8b0b9aded4c4cc0b2085d6a7c5611c7",
     "keywords": [],
     "children": [
       {
         "PostgreSQL初阶": {
-          "node_id": "pg-6089aef54c4c4ce7bc85b4dfa14f44cd",
+          "node_id": "pg-f1c160affc45417a9c5fff7dc4be448a",
           "keywords": [],
           "children": [
             {
               "PostgreSQL基本概念": {
-                "node_id": "pg-b710bd5c63fb4651bebfdd9b3fdb17a5",
+                "node_id": "pg-1aad17890736469a8b2f61a36dfe41db",
                 "keywords": [],
                 "children": [
                   {
                     "关系型数据库": {
-                      "node_id": "pg-6920a4f2ba864459bd8883a7a48fa238",
+                      "node_id": "pg-11d131b2d01b40be90b23f096d4852cc",
                       "keywords": [],
                       "children": []
                     }
                   },
                   {
                     "服务器和客户端": {
-                      "node_id": "pg-40374311856c4ad3b76fff16ecbe9dce",
+                      "node_id": "pg-cf0e5cb243a247e2a0b812c5798cdba4",
                       "keywords": [],
                       "children": []
                     }
@@ -32,7 +32,7 @@
             },
             {
               "PostgreSQL的安装": {
-                "node_id": "pg-3ac4a2bf31af423fb9e2ec9fe30024c5",
+                "node_id": "pg-d95edf2d942b45d781e112be785ce260",
                 "keywords": [],
                 "children": [
                   {
@@ -56,7 +56,10 @@
                   {
                     "使用PostgreSQL": {
                       "node_id": "pg-c252ff4b0e7f4163837c9b6f81678505",
-                      "keywords": [],
+                      "keywords": [
+                        "login",
+                        "connect"
+                      ],
                       "children": []
                     }
                   }
@@ -65,34 +68,35 @@
             },
             {
               "查询数据": {
-                "node_id": "pg-7e2e52dbddb44d5bad6deea6c5e57198",
+                "node_id": "pg-30f905f73a574151994d6d7f58d8a20d",
                 "keywords": [],
                 "children": [
                   {
-                    "SQL基本语法": {
-                      "node_id": "pg-dca8da7637f94ded91a1871daa51746e",
+                    "psql": {
+                      "node_id": "pg-ee5c6d4a073b45a7995ba351ab9de46e",
                       "keywords": [],
                       "children": []
                     }
                   },
                   {
-                    "SQL、DML和DDL": {
-                      "node_id": "pg-b0f366abe12e41b0a9672d317e556662",
-                      "keywords": [],
-                      "children": []
-                    }
-                  },
-                  {
-                    "PostgreSQL的数据类型": {
-                      "node_id": "pg-1eae8a80615f436081e71b36d89fb0aa",
-                      "keywords": [],
+                    "SQL基本语法": {
+                      "node_id": "pg-dca8da7637f94ded91a1871daa51746e",
+                      "keywords": [
+                        "语法",
+                        "select"
+                      ],
                       "children": []
                     }
                   },
                   {
-                    "函数调用": {
-                      "node_id": "pg-ebef9fceb3684b119a9ba221a81f304b",
-                      "keywords": [],
+                    "SQL、DML和DDL": {
+                      "node_id": "pg-b0f366abe12e41b0a9672d317e556662",
+                      "keywords": [
+                        "DML",
+                        "insert",
+                        "update",
+                        "delete"
+                      ],
                       "children": []
                     }
                   }
@@ -104,7 +108,7 @@
       },
       {
         "PostgreSQL中阶": {
-          "node_id": "pg-c360138dad92431594130596c5c91394",
+          "node_id": "pg-fc32585f4136497ea9be2d057d4aeada",
           "keywords": [],
           "children": [
             {
@@ -197,13 +201,6 @@
                       "children": []
                     }
                   },
-                  {
-                    "DML": {
-                      "node_id": "pg-e1cd59819dd74a0bacc707f7863aad53",
-                      "keywords": [],
-                      "children": []
-                    }
-                  },
                   {
                     "过程化编程": {
                       "node_id": "pg-eb4048b7dfd3469f8049330ba78427b5",
@@ -226,7 +223,7 @@
       },
       {
         "PostgreSQL高阶": {
-          "node_id": "pg-2f46da8212cf41ad9c0d2a5bf1330adc",
+          "node_id": "pg-c9c7629c52064d8780cbd4dc14dbe351",
           "keywords": [],
           "children": [
             {
@@ -263,13 +260,6 @@
                 "node_id": "pg-f80410c703044bfea61b2f3a4fbc5705",
                 "keywords": [],
                 "children": [
-                  {
-                    "自定义类型": {
-                      "node_id": "pg-ec4bbb39e76949b48b13f04cc8c16532",
-                      "keywords": [],
-                      "children": []
-                    }
-                  },
                   {
                     "几何类型和GIS": {
                       "node_id": "pg-3bbe12c0a19d4cb7a61dc0a20624ed89",
@@ -340,20 +330,6 @@
                       "keywords": [],
                       "children": []
                     }
-                  },
-                  {
-                    "表函数": {
-                      "node_id": "pg-e4b00736ab4c483785c022a0a464f30a",
-                      "keywords": [],
-                      "children": []
-                    }
-                  },
-                  {
-                    "结果集类型": {
-                      "node_id": "pg-0e280b203b524a28ab8587aac125a865",
-                      "keywords": [],
-                      "children": []
-                    }
                   }
                 ]
               }