on tree

data/1.MySQL初阶/2.安装和登录/4. 创建和删除数据库/config.json

+{
+  "node_id": "mysql-764d5080ddb943fe9236922984afa152",
+  "keywords": [],
+  "children": [],
+  "export": [],
+  "keywords_must": [],
+  "keywords_forbid": [],
+  "group": 0
+}
\ No newline at end of file

data/2.MySQL中阶/1.基本结构/1.自增主键/config.json

+{
+  "node_id": "mysql-d2cdd250a5f24c8e9676e0fa1faf5772",
+  "keywords": [],
+  "children": [],
+  "export": [],
+  "keywords_must": [],
+  "keywords_forbid": [],
+  "group": 0
+}
\ No newline at end of file

data/2.MySQL中阶/1.基本结构/2.视图/config.json

+{
+  "node_id": "mysql-98e926730d844f238dc9cd8ac5f65126",
+  "keywords": [],
+  "children": [],
+  "export": [],
+  "keywords_must": [],
+  "keywords_forbid": [],
+  "group": 0
+}
\ No newline at end of file

data/2.MySQL中阶/1.基本结构/6.数据库扩展/config.json

-{
-  "node_id": "mysql-88c53ba3b31f4ae5a4de3809d61cf539",
-  "keywords": [
-    "数据库扩展",
-    "数据库插件",
-    "extension"
-  ],
-  "children": [],
-  "export": [
-    "language.json",
-    "extension.json"
-  ],
-  "keywords_must": [
-    "数据库扩展",
-    "extension"
-  ],
-  "keywords_forbid": []
-}
\ No newline at end of file

data/2.MySQL中阶/1.基本结构/6.数据库扩展/extension.json

-{
-  "type": "code_options",
-  "author": "ccat",
-  "source": "extension.md",
-  "notebook_enable": false,
-  "exercise_id": "8875ecad1e9f403bbad6f68f2f5d6a9f"
-}
\ No newline at end of file

data/2.MySQL中阶/1.基本结构/6.数据库扩展/extension.md

-# 外部扩展
-
-下列哪个功能需要通过`create exension`语句安装扩展得到？
-
-## 答案
-
-postgis
-
-## 选项
-
-### A
-
-全文检索
-
-### B
-
-JSONB
-
-### C
-
-GIST 和 GIN 索引
-
-### D
-
-JSON Path 支持
-
-### E
-
-XML 和 XSLT 支持
-
-### F
-
-面向对象语法

data/2.MySQL中阶/1.基本结构/6.数据库扩展/language.json

-{
-  "type": "code_options",
-  "author": "ccat",
-  "source": "language.md",
-  "notebook_enable": false,
-  "exercise_id": "1d88714991c849c7ad65b9b4fa17c583"
-}
\ No newline at end of file

data/2.MySQL中阶/1.基本结构/6.数据库扩展/language.md

-# 过程语言
-
-关于 PostgreSQL PL 语言，错误的是：
-
-## 答案
-
-要安装新的扩展语言，需要重新编译 PostgreSQL 内核。
-
-## 选项
-
-### A
-
-PG 可以支持 Python、Perl、Lua 等多种 PL 语言编写函数。
-
-### B
-
-通过 create language 可以安装新的 pl 语言支持
-
-### C
-
-实现新的 PL 语言需要遵循 PostgreSQL 的语言扩展规范。
-
-### D
-
-用外部语言实现函数，要考虑跨边界传递数据的开销
\ No newline at end of file

data/2.MySQL中阶/1.基本结构/7.存储引擎/config.json

+{
+  "node_id": "mysql-af89d54d66974111b4f67aeba2af7161",
+  "keywords": [],
+  "children": [],
+  "export": []
+}
\ No newline at end of file

data/2.MySQL中阶/1.基本结构/9.存储引擎/config.json

+{
+  "node_id": "mysql-af89d54d66974111b4f67aeba2af7161",
+  "keywords": [],
+  "children": [],
+  "export": [],
+  "keywords_must": []
+}
\ No newline at end of file

data/2.MySQL中阶/2. 查询/1. WHERE/config.json

+{
+  "node_id": "mysql-2296dbe96d584a52bd28a3ad5f655518",
+  "keywords": [],
+  "children": [],
+  "export": [],
+  "keywords_must": [],
+  "keywords_forbid": [],
+  "group": 0
+}
\ No newline at end of file

data/2.MySQL中阶/2. 查询/2.CASE/config.json

+{
+  "node_id": "mysql-8e6cd4d5f4b446a2bc3f5402de9bd49c",
+  "keywords": [],
+  "children": [],
+  "export": [],
+  "keywords_must": [],
+  "keywords_forbid": [],
+  "group": 0
+}
\ No newline at end of file

data/2.MySQL中阶/2. 查询/3.DISTINCT/config.json

+{
+  "node_id": "mysql-153ce0dadc824af98de199f193c8c75c",
+  "keywords": ["distinct"],
+  "children": [],
+  "export": [],
+  "keywords_must": [],
+  "keywords_forbid": [],
+  "group": 0
+}
\ No newline at end of file

data/2.MySQL中阶/2. 查询/4.ORDER BY/config.json

+{
+  "node_id": "mysql-fa20a81805b44975aed265dd058c542a",
+  "keywords": [],
+  "children": [],
+  "export": [],
+  "keywords_must": [],
+  "keywords_forbid": [],
+  "group": 0
+}
\ No newline at end of file

data/2.MySQL中阶/2. 查询/5.UNION/config.json

+{
+  "node_id": "mysql-b57b6c08f5f240c6a997284e4448f088",
+  "keywords": [],
+  "children": [],
+  "export": [],
+  "keywords_must": [],
+  "keywords_forbid": [],
+  "group": 0
+}
\ No newline at end of file

data/2.MySQL中阶/2.服务端编程/config.json → data/2.MySQL中阶/2. 查询/config.json

 {
-  "node_id": "mysql-64454fb14452475a8c3b348bf4d840cc",
+  "node_id": "mysql-ed0a3aa2ca704780ae72749842657fa7",
   "keywords": [],
   "keywords_must": [],
-  "keywords_forbid": []
+  "keywords_forbid": [],
+  "group": 0
 }
\ No newline at end of file

data/2.MySQL中阶/2.服务端编程/5.CTE/config.json

-{
-  "node_id": "mysql-a69988041f934af1af39f2da4b3e0d58",
-  "keywords": [
-    "common table expression",
-    "cte",
-    "recursive"
-  ],
-  "children": [],
-  "export": [
-    "to_root.json"
-  ],
-  "keywords_must": [
-    "cte"
-  ],
-  "keywords_forbid": []
-}
\ No newline at end of file

data/2.MySQL中阶/2.服务端编程/5.CTE/to_root.json

-{
-  "type": "code_options",
-  "author": "ccat",
-  "source": "to_root.md",
-  "notebook_enable": false,
-  "exercise_id": "3d631bd0b26b44b4a8951ef7d4f865ec"
-}
\ No newline at end of file

data/2.MySQL中阶/2.服务端编程/5.CTE/to_root.md

-# 树结构溯根
-
-现有一个表 node
-
-```postgresql
-create table node
-(
-    id      serial primary key,
-    pid     integer,
-    content text
-);
-```
-
-其 pid 列引用 id 列，形成一个树结构，根节点的 pid 为 0。
-
-现在我们希望写一个查询，找到某一个给定id的记录，其父节点、父节点的父节点，直至根节点的路径。那么这个查询应该是：
-
-## 答案
-
-```postgresql
-with recursive t(id, pid, content) as (
-    select id, pid, content
-    from node
-    where id = $1
-    union all
-    select node.id, node.pid, node.content
-    from node
-             join t on node.id = t.pid)
-select node.id, node.pid, content
-from node
-         join t on node.id = t.id;
-```
-
-## 选项
-
-### 没有递归定义
-
-```postgresql
-with t as (
-    select id, pid, content
-    from node
-    where id = $1
-    union all
-    select node.id, node.pid, node.level
-    from node
-             join t on node.id = t.pid)
-select node.id, node.pid, content
-from node
-         join t on node.id = t.id;
-```
-
-### 平凡的连接查询无法处理递归问题
-
-```postgresql
-select node.id, node.pid, node.content
-from node
-         join node as p on node.pid = p.id
-where id = $1;
-```
-
-### 子查询无法处理递归问题
-
-```postgresql
-select node.id, node.pid, node content
-from node as t
-where t.pid = (select id from t where id = t.pid)
-```
\ No newline at end of file

data/2.MySQL中阶/2.服务端编程/6.过程化编程/config.json

-{
-  "node_id": "mysql-7b3a382e0cdb4f089fb3b1769c91025f",
-  "keywords": [
-    "plsql",
-    "过程化"
-  ],
-  "children": [],
-  "export": [
-    "loop.json"
-  ],
-  "keywords_must": [
-    "过程化"
-  ],
-  "keywords_forbid": []
-}
\ No newline at end of file

data/2.MySQL中阶/2.服务端编程/6.过程化编程/loop.json

-{
-  "type": "code_options",
-  "author": "ccat",
-  "source": "loop.md",
-  "notebook_enable": false,
-  "exercise_id": "4f53e1f2bc704c7fbe4b2586d690d3ff"
-}
\ No newline at end of file

data/2.MySQL中阶/2.服务端编程/6.过程化编程/loop.md

-# 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

data/2.MySQL中阶/2.服务端编程/7.DDL/analyze.json

-{
-  "type": "code_options",
-  "author": "ccat",
-  "source": "analyze.md",
-  "notebook_enable": false,
-  "exercise_id": "df45f27112f7405888a5ee7e18d78b87"
-}
\ No newline at end of file

data/2.MySQL中阶/2.服务端编程/7.DDL/analyze.md

-# 建表权限
-
-SmartMarket 公司有一百名分析师，他们都属于 analyst 团队，现在他们希望能够在 market 仓库的 ana schema 下
-自由的建表和删除表，以便进行模型试验。下列操作步骤中需要选择哪几项？(ana schema 和分析师的团队角色还不存在)
-
-1. `create schema ana`
-2. `create role analyst`
-3. `grant create, usage on schema ana to analyst`
-4. 将 analyst 角色授予每个分析师的账号
-5. 删除 public schema
-6. `grant superuser on schema ana to analyst`
-7. `grant owner on schema ana to analyst;`
-
-## 答案
-
-1，2， 3， 4
-
-## 选项
-
-### A
-
-所有全部
-
-### B
-
-1, 2, 5, 6, 7
-
-### C
-
-1, 2, 6, 7
-
-### D
-
-1, 2, 3, 6, 7
-
-### E
-
-2, 3, 4, 5
\ No newline at end of file

data/2.MySQL中阶/2.服务端编程/7.DDL/config.json

-{
-  "node_id": "mysql-2bd968a23ccb4668b853421206b46eeb",
-  "keywords": [
-    "创建表",
-    "授权",
-    "ddl"
-  ],
-  "children": [],
-  "export": [
-    "create_table.json",
-    "analyze.json"
-  ],
-  "keywords_must": [
-    "创建表",
-    "授权",
-    "ddl"
-  ],
-  "keywords_forbid": []
-}
\ No newline at end of file

data/2.MySQL中阶/2.服务端编程/7.DDL/create_table.json

-{
-  "type": "code_options",
-  "author": "ccat",
-  "source": "create_table.md",
-  "notebook_enable": false,
-  "exercise_id": "d6e788dd034b4e0093b8ca39a8dd6b6b"
-}
\ No newline at end of file

data/2.MySQL中阶/2.服务端编程/7.DDL/create_table.md

-# 创建表
-
-下列方法中，可以创建表的有：
-
-1. 使用 `create table xxx();`语句
-2. 使用 `copy` 语句从 csv 导入数据
-3. 使用 `create table as select...` 语句从查询中创建表 
-
-## 答案
-
-1， 3
-
-## 选项
-
-### A
-
-1, 2, 3
-
-### B
-
-1, 2
-
-### C
-
-2, 3
-
-### D
-
-只有 1
\ No newline at end of file

data/2.MySQL中阶/3.聚合和分组/1. 计数/config.json

+{
+  "node_id": "mysql-ac3c072bc54749bdb82324f2b203890d",
+  "keywords": [],
+  "children": [],
+  "export": [],
+  "keywords_must": [],
+  "keywords_forbid": [],
+  "group": 0
+}
\ No newline at end of file

data/2.MySQL中阶/3.聚合和分组/2. 求和/config.json

+{
+  "node_id": "mysql-c5654c150993418a96f692496837fbb7",
+  "keywords": [],
+  "children": [],
+  "export": [],
+  "keywords_must": [],
+  "keywords_forbid": [],
+  "group": 0
+}
\ No newline at end of file

data/2.MySQL中阶/3.聚合和分组/3.最小值/config.json

+{
+  "node_id": "mysql-c1652108441c424197c0c3c526e4831c",
+  "keywords": [],
+  "children": [],
+  "export": [],
+  "keywords_must": [],
+  "keywords_forbid": [],
+  "group": 0
+}
\ No newline at end of file

data/2.MySQL中阶/3.聚合和分组/4. 最大值/config.json

+{
+  "node_id": "mysql-77042376726743bea5c97e82a67a2016",
+  "keywords": [],
+  "children": [],
+  "export": [],
+  "keywords_must": [],
+  "keywords_forbid": [],
+  "group": 0
+}
\ No newline at end of file

data/2.MySQL中阶/3.聚合和分组/5. 平均值/config.json

+{
+  "node_id": "mysql-11462fccf9d24d17a372d5c60af90f54",
+  "keywords": [],
+  "children": [],
+  "export": [],
+  "keywords_must": [],
+  "keywords_forbid": [],
+  "group": 0
+}
\ No newline at end of file

data/2.MySQL中阶/3.聚合和分组/6.HAVING/config.json

+{
+  "node_id": "mysql-3b85e53dd88146798d21b7254ad85cae",
+  "keywords": [],
+  "children": [],
+  "export": [],
+  "keywords_must": [],
+  "keywords_forbid": [],
+  "group": 0
+}
\ No newline at end of file

data/2.MySQL中阶/3.聚合和分组/7.WITH ROLLUP/config.json

+{
+  "node_id": "mysql-91829d4938034ce09e99badf23dbebf6",
+  "keywords": [],
+  "children": [],
+  "export": [],
+  "keywords_must": [],
+  "keywords_forbid": [],
+  "group": 0
+}
\ No newline at end of file

data/2.MySQL中阶/4.连接查询/1.INNER JOIN/config.json

+{
+  "node_id": "mysql-73bfbd883511436c85130b71fa108038",
+  "keywords": [],
+  "children": [],
+  "export": [],
+  "keywords_must": [],
+  "keywords_forbid": [],
+  "group": 0
+}
\ No newline at end of file

data/2.MySQL中阶/4.连接查询/2. LEFT JOIN/config.json

+{
+  "node_id": "mysql-d7a8869fb798498c839c913ce930015d",
+  "keywords": [],
+  "children": [],
+  "export": [],
+  "keywords_must": [],
+  "keywords_forbid": [],
+  "group": 0
+}
\ No newline at end of file

data/2.MySQL中阶/4.连接查询/3. RIGHT JOIN/config.json

+{
+  "node_id": "mysql-7c2331eea3e84eef9464ad4d7c03e2de",
+  "keywords": [],
+  "children": [],
+  "export": [],
+  "keywords_must": [],
+  "keywords_forbid": [],
+  "group": 0
+}
\ No newline at end of file

data/2.MySQL中阶/4.连接查询/4. CROSS JOIN/config.json

+{
+  "node_id": "mysql-fd27af20b046463eac7b2712885ac018",
+  "keywords": [],
+  "children": [],
+  "export": [],
+  "keywords_must": [],
+  "keywords_forbid": [],
+  "group": 0
+}
\ No newline at end of file

data/2.MySQL中阶/4.连接查询/5. 复杂连接/config.json

+{
+  "node_id": "mysql-a4773004e0cf432aa7ccdf6b9490838f",
+  "keywords": [],
+  "children": [],
+  "export": [],
+  "keywords_must": [],
+  "keywords_forbid": [],
+  "group": 0
+}
\ No newline at end of file