mistakes fixed

data/2.MySQL中阶/4.子查询/6. 列子查询/in_column.md

@@ -3,7 +3,8 @@
 Joe 打算写一个查询，根据员工表
 
 ```mysql
-create table employee(
+create table employee
+(
     id   int primary key auto_increment,
     dept varchar(256),
     name varchar(256),
@@ -17,6 +18,39 @@ create table employee(
 
 ```mysql
 select distinct(dept)                  as dept,
-               (select count(*) from employee as i where i.dept=o.dept) as emp  
+               (select count(*)
+                from employee as i
+                where i.dept = o.dept) as emp
+from employee as o;
+```
+
+## 选项
+
+### A
+
+```mysql
+select distinct(dept)               as dept,
+               (select count(*)
+                from employee as i) as emp
+from employee as o;
+```
+
+### B
+
+```mysql
+select distinct(dept)              as dept,
+               (select count(*)
+                from employee
+                where dept = dept) as emp
+from employee
+```
+
+### C
+
+```mysql
+select dept                    as dept,
+       (select count(*)
+        from employee as i
+        where i.dept = o.dept) as emp
 from employee as o
 ```
\ No newline at end of file

data/2.MySQL中阶/9.用户和权限/3.查看用户权限/view_privileges.md

-# 
+# 查看用户权限
\ No newline at end of file
+
+Joe 想要查看 Fred 的 MySQL 账户 `'fred'@'%'` 的权限，他应该怎么做？
+
+## 答案
+
+```mysql
+show grants for fred;
+```
+
+## 选项
+
+### A
+
+```mysql
+select grants from fred;
+```
+
+### B
+
+```mysql
+show privileges for fred;
+```
+
+### B
+
+```mysql
+show privileges from fred;
+```

data/2.MySQL中阶/9.用户和权限/5.修改用户密码/change_password.md

 # 修改口令
 
-Fred 有一个 `'fred'@'%'` 账户，但是他忘了密码，需要 Joe 帮他修改一个新口令，
-Joe 准备将这个口令初始化为 'goods123fred'，并设置为登录后修改新口令。
-Joe 应该怎么操作？
+Fred 有一个名为 `'fred'@'%'` 的 MySQL 账户，但是他忘了密码，需要 Joe 帮他修改一个新口令， 
+Joe 准备将这个账户的口令初始化为 `goods123fred` ，
+并设置为登录后修改新口令。他应该怎么做？
 
 ## 答案
 

data/3.MySQL高阶/1.深入索引/10.JSON索引/config.json

-{
-  "node_id": "mysql-9f8881b9f30544149327af68e3007603",
-  "keywords": [],
-  "children": [],
-  "export": [],
-  "keywords_must": [],
-  "keywords_forbid": [],
-  "group": 0
-}
\ No newline at end of file

data/3.MySQL高阶/1.深入索引/13.全文索引/config.json → data/3.MySQL高阶/1.深入索引/10.全文索引/config.json

 {
   "node_id": "mysql-ba3fc0140b5842bb949c591d059e3269",
-  "keywords": ["full text index", "fti"],
+  "keywords": [
+    "full text index",
+    "fti"
+  ],
   "children": [],
-  "export": [],
+  "export": [
+    "full_text_index.json"
+  ],
   "keywords_must": [],
   "keywords_forbid": [],
   "group": 0

data/3.MySQL高阶/1.深入索引/10.全文索引/full_text_index.json

+{
+  "type": "code_options",
+  "author": "ccat",
+  "source": "full_text_index.md",
+  "notebook_enable": false,
+  "exercise_id": "42e674c6764a40eb9124b6bffb6222fa"
+}
\ No newline at end of file

data/3.MySQL高阶/1.深入索引/10.全文索引/full_text_index.md

+# 全文索引
+
+Shop 表的部分字段如下：
+
+```mysql
+create table shop (
+    id int primary key auto_increment,
+    description varchar(8000)
+      -- ...
+)
+```
+
+现在 Joe 要给 description 字段加上全文索引，他应该怎么做？
+
+## 答案
+
+```mysql
+alter table shop add fulltext(description);
+```
+
+## 选项
+
+### A
+
+```mysql
+alter table shop add index fulltext(description);
+```
+
+### B
+
+```mysql
+alter table shop create fulltext(description);
+```
+
+### C
+
+```mysql
+alter table shop alter description add fulltext(description);
+```
\ No newline at end of file

data/3.MySQL高阶/1.深入索引/14.隐藏索引/config.json → data/3.MySQL高阶/1.深入索引/11.隐藏索引/config.json

@@ -2,7 +2,9 @@
   "node_id": "mysql-c57e1195b0914cd38798ce029156ec87",
   "keywords": [],
   "children": [],
-  "export": [],
+  "export": [
+    "invisible.json"
+  ],
   "keywords_must": [],
   "keywords_forbid": [],
   "group": 0

data/3.MySQL高阶/1.深入索引/11.隐藏索引/invisible.json

+{
+  "type": "code_options",
+  "author": "ccat",
+  "source": "invisible.md",
+  "notebook_enable": false,
+  "exercise_id": "07a6f3f1f98d49249a2ba14fae5a4cad"
+}
\ No newline at end of file

data/3.MySQL高阶/1.深入索引/11.隐藏索引/invisible.md

+# 隐藏索引
+
+Shop 表的部分字段如下：
+
+```mysql
+create table shop (
+    id int primary key auto_increment,
+    description varchar(8000),
+    fulltext (description)
+      -- ...
+)
+```
+
+已知 description 字段上的全文索引名为 description。因为这个表已经很大，Joe 
+想要删掉这个索引，但是他不确定是否有程序还在使用它，
+
+Joe 应该怎么做？
+
+## 答案
+
+先执行
+
+```mysql
+alter table shop alter index description invisible ;
+```
+
+将索引隐藏，观察确认没有影响后再执行
+
+```mysql
+alter table shop drop index description;
+```
+
+删除。
+
+
+## 选项
+
+### A
+
+先备份 shop 表，然后执行
+
+```mysql
+alter table shop drop index description;
+```
+删除，有问题的话从备份文件恢复。
+
+### B
+
+备份 shop ，然后删除重建，重建时去掉 description 相关的索引逻辑。
+
+### C
+
+先执行
+
+```mysql
+alter table shop alter index description invisible ;
+```
+
+将索引隐藏，确认后再执行
+
+```mysql
+alter table shop alter index description visible ;
+```
+
+恢复索引可见。
\ No newline at end of file

data/3.MySQL高阶/1.深入索引/8.NULL/config.json

-{
-  "node_id": "mysql-cc8d1f5fa1e74b6bac93488149c5845f",
-  "keywords": [],
-  "children": [],
-  "export": [],
-  "keywords_must": [],
-  "keywords_forbid": [],
-  "group": 0
-}
\ No newline at end of file

data/3.MySQL高阶/1.深入索引/9.LIKE/config.json

-{
-  "node_id": "mysql-387801d5a5124f78a7bf3d68f3618a57",
-  "keywords": ["like"],
-  "children": [],
-  "export": [],
-  "keywords_must": [],
-  "keywords_forbid": [],
-  "group": 0
-}
\ No newline at end of file

data/3.MySQL高阶/1.深入索引/12.空间索引/config.json → data/3.MySQL高阶/1.深入索引/9.空间索引/config.json

@@ -2,8 +2,10 @@
   "node_id": "mysql-2f417818ad3449268396157cbb9d4d9c",
   "keywords": [],
   "children": [],
-  "export": [],
+  "export": [
+    "geo_index.json"
+  ],
   "keywords_must": [],
   "keywords_forbid": [],
-  "group": 0
+  "group": 2
 }
\ No newline at end of file

data/3.MySQL高阶/1.深入索引/9.空间索引/geo_index.json

+{
+  "type": "code_options",
+  "author": "ccat",
+  "source": "geo_index.md",
+  "notebook_enable": false,
+  "exercise_id": "4ff8589a210e4ed2bf20aba25082e04a"
+}
\ No newline at end of file

data/3.MySQL高阶/1.深入索引/9.空间索引/geo_index.md

+# 几何索引
+
+Goods 数据库中有一个 shop 表，其中包含如下字段：
+
+```mysql
+create table shop (
+    id int primary key auto_increment,
+    location GEOMETRY
+      -- ...
+)
+```
+
+现在 Joe 要给 location 字段加上几何索引，他应该怎么做？
+
+## 答案
+
+```mysql
+alter table shop modify location  GEOMETRY not null;
+alter table shop add INDEX geo_index(location);
+```
+
+## 选项
+
+### A
+
+```mysql
+alter table shop add INDEX geo_index(location);
+```
+
+### B
+
+```mysql
+alter table shop add INDEX location;
+```
+
+### C
+
+```mysql
+alter table shop modify location  GEOMETRY not null;
+alter table shop add INDEX location;
+```
+
+### D
+
+```mysql
+alter table shop modify location  GEOMETRY not null;
+alter table shop add INDEX location;
+```

data/tree.json

@@ -1349,7 +1349,7 @@
                       "children": [],
                       "keywords_must": [],
                       "keywords_forbid": [],
-                      "group": 0
+                      "group": 1
                     }
                   },
                   {
@@ -1359,7 +1359,7 @@
                       "children": [],
                       "keywords_must": [],
                       "keywords_forbid": [],
-                      "group": 0
+                      "group": 1
                     }
                   },
                   {
@@ -1369,7 +1369,7 @@
                       "children": [],
                       "keywords_must": [],
                       "keywords_forbid": [],
-                      "group": 0
+                      "group": 1
                     }
                   },
                   {
@@ -1381,7 +1381,7 @@
                       "children": [],
                       "keywords_must": [],
                       "keywords_forbid": [],
-                      "group": 0
+                      "group": 1
                     }
                   },
                   {
@@ -1391,7 +1391,7 @@
                       "children": [],
                       "keywords_must": [],
                       "keywords_forbid": [],
-                      "group": 0
+                      "group": 1
                     }
                   },
                   {
@@ -1401,7 +1401,7 @@
                       "children": [],
                       "keywords_must": [],
                       "keywords_forbid": [],
-                      "group": 0
+                      "group": 1
                     }
                   },
                   {
@@ -1414,7 +1414,7 @@
                       "children": [],
                       "keywords_must": [],
                       "keywords_forbid": [],
-                      "group": 0
+                      "group": 2
                     }
                   }
                 ],
@@ -1522,38 +1522,6 @@
                       "group": 0
                     }
                   },
-                  {
-                    "NULL": {
-                      "node_id": "mysql-cc8d1f5fa1e74b6bac93488149c5845f",
-                      "keywords": [],
-                      "children": [],
-                      "keywords_must": [],
-                      "keywords_forbid": [],
-                      "group": 0
-                    }
-                  },
-                  {
-                    "LIKE": {
-                      "node_id": "mysql-387801d5a5124f78a7bf3d68f3618a57",
-                      "keywords": [
-                        "like"
-                      ],
-                      "children": [],
-                      "keywords_must": [],
-                      "keywords_forbid": [],
-                      "group": 0
-                    }
-                  },
-                  {
-                    "JSON索引": {
-                      "node_id": "mysql-9f8881b9f30544149327af68e3007603",
-                      "keywords": [],
-                      "children": [],
-                      "keywords_must": [],
-                      "keywords_forbid": [],
-                      "group": 0
-                    }
-                  },
                   {
                     "组合索引": {
                       "node_id": "mysql-ce1f863b4d254d2aadb6ce2331122d16",
@@ -1573,7 +1541,7 @@
                       "children": [],
                       "keywords_must": [],
                       "keywords_forbid": [],
-                      "group": 0
+                      "group": 2
                     }
                   },
                   {