diff --git "a/data/2.MySQL\344\270\255\351\230\266/6.\345\255\220\346\237\245\350\257\242/4.EXISTS/config.json" "b/data/2.MySQL\344\270\255\351\230\266/6.\345\255\220\346\237\245\350\257\242/4.EXISTS/config.json"
index 4723747805f67a06ac8cdc46edab0f240f243d6c..f6d0e3f2105f6041f11ef8848d846012105d2286 100644
--- "a/data/2.MySQL\344\270\255\351\230\266/6.\345\255\220\346\237\245\350\257\242/4.EXISTS/config.json"
+++ "b/data/2.MySQL\344\270\255\351\230\266/6.\345\255\220\346\237\245\350\257\242/4.EXISTS/config.json"
@@ -2,9 +2,14 @@
   "node_id": "mysql-6c6789b86f714acaa76467fdf9623191",
   "keywords": [],
   "children": [],
-  "export": [],
+  "export": [
+    "exists.json"
+  ],
   "keywords_must": [
-    ["mysql", "exists"]
+    [
+      "mysql",
+      "exists"
+    ]
   ],
   "keywords_forbid": [
     "not exists"
diff --git "a/data/2.MySQL\344\270\255\351\230\266/6.\345\255\220\346\237\245\350\257\242/4.EXISTS/exists.json" "b/data/2.MySQL\344\270\255\351\230\266/6.\345\255\220\346\237\245\350\257\242/4.EXISTS/exists.json"
new file mode 100644
index 0000000000000000000000000000000000000000..d676a63a5bdd27948f9a6ca7c7ccd3ed9a5c7531
--- /dev/null
+++ "b/data/2.MySQL\344\270\255\351\230\266/6.\345\255\220\346\237\245\350\257\242/4.EXISTS/exists.json"
@@ -0,0 +1,7 @@
+{
+  "type": "code_options",
+  "author": "ccat",
+  "source": "exists.md",
+  "notebook_enable": false,
+  "exercise_id": "8d0da43e53624d8187ac781f685f4b71"
+}
\ No newline at end of file
diff --git "a/data/2.MySQL\344\270\255\351\230\266/6.\345\255\220\346\237\245\350\257\242/4.EXISTS/exists.md" "b/data/2.MySQL\344\270\255\351\230\266/6.\345\255\220\346\237\245\350\257\242/4.EXISTS/exists.md"
new file mode 100644
index 0000000000000000000000000000000000000000..1769f298d30f29536d97dc9ffe67e1f6e3ea25ea
--- /dev/null
+++ "b/data/2.MySQL\344\270\255\351\230\266/6.\345\255\220\346\237\245\350\257\242/4.EXISTS/exists.md"
@@ -0,0 +1,56 @@
+# Exists
+
+Joe 想从员工表
+
+```mysql
+create table employee(
+    id int primary key auto_increment,
+    dept int,
+    name varchar(256),
+    post varchar(16)
+)
+```
+
+中找出所有其所在部门没有助理（post 为 `assistant`）的员工信息。由于 Joe 没有其它表的查询权限，
+他只能查询员工表，并且这一次他想用 exists 实现。这个查询应该是：
+
+## 答案
+
+```mysql
+select id, name, dept 
+from employee as o
+where not exists(select * from employee as i where o.dept = i.dept and post='assistant'); 
+```
+
+## 选项
+
+### A
+
+```mysql
+select id, name, dept
+from employee as o
+where exists(select * from employee as i where o.dept = i.dept and post='assistant'); 
+```
+
+### B
+
+```mysql
+select id, name, dept
+from employee as o
+where not exists(select * from employee as i where o.dept = i.dept and post='assistant'); 
+```
+
+### C
+```mysql
+select id, name, dept 
+from employee as o
+where 'assistant' != exists(select post from employee as i); 
+```
+
+### D
+
+```mysql
+select id, name, dept 
+from employee as o
+where 'assistant' = not exists(select post from employee as i where o.dept = i.dept); 
+```
\ No newline at end of file
diff --git "a/data/2.MySQL\344\270\255\351\230\266/6.\345\255\220\346\237\245\350\257\242/6. IN/config.json" "b/data/2.MySQL\344\270\255\351\230\266/6.\345\255\220\346\237\245\350\257\242/5. IN/config.json"
similarity index 70%
rename from "data/2.MySQL\344\270\255\351\230\266/6.\345\255\220\346\237\245\350\257\242/6. IN/config.json"
rename to "data/2.MySQL\344\270\255\351\230\266/6.\345\255\220\346\237\245\350\257\242/5. IN/config.json"
index ff41677b56cc9339def16dabd017f1d2a198733d..a7370332622cad746bab13b4e68e2938987110ba 100644
--- "a/data/2.MySQL\344\270\255\351\230\266/6.\345\255\220\346\237\245\350\257\242/6. IN/config.json"	
+++ "b/data/2.MySQL\344\270\255\351\230\266/6.\345\255\220\346\237\245\350\257\242/5. IN/config.json"	
@@ -2,9 +2,14 @@
   "node_id": "mysql-8436069c855c4f1ead7cf11a026e004b",
   "keywords": [],
   "children": [],
-  "export": [],
+  "export": [
+    "in.json"
+  ],
   "keywords_must": [
-    ["mysql", "in"]
+    [
+      "mysql",
+      "in"
+    ]
   ],
   "keywords_forbid": [
     "not in"
diff --git "a/data/2.MySQL\344\270\255\351\230\266/6.\345\255\220\346\237\245\350\257\242/5. IN/in.json" "b/data/2.MySQL\344\270\255\351\230\266/6.\345\255\220\346\237\245\350\257\242/5. IN/in.json"
new file mode 100644
index 0000000000000000000000000000000000000000..9eb73c2410614a0987bde7b7427826dcd992ac0c
--- /dev/null
+++ "b/data/2.MySQL\344\270\255\351\230\266/6.\345\255\220\346\237\245\350\257\242/5. IN/in.json"	
@@ -0,0 +1,7 @@
+{
+  "type": "code_options",
+  "author": "ccat",
+  "source": "in.md",
+  "notebook_enable": false,
+  "exercise_id": "2ded48602e384fc2b5476186e8b91842"
+}
\ No newline at end of file
diff --git "a/data/2.MySQL\344\270\255\351\230\266/6.\345\255\220\346\237\245\350\257\242/5. IN/in.md" "b/data/2.MySQL\344\270\255\351\230\266/6.\345\255\220\346\237\245\350\257\242/5. IN/in.md"
new file mode 100644
index 0000000000000000000000000000000000000000..4113cc5d079df09a0824f6336100e7c848fed673
--- /dev/null
+++ "b/data/2.MySQL\344\270\255\351\230\266/6.\345\255\220\346\237\245\350\257\242/5. IN/in.md"	
@@ -0,0 +1,56 @@
+# IN
+
+Joe 想要从员工表
+
+```mysql
+create table employee(
+    id int primary key auto_increment,
+    dept int,
+    name varchar(256),
+    post varchar(16)
+)
+```
+
+中查询出研发部（dept为'rd')和人力资源部(dept为'hr')的员工列表，这个查询应该怎么写？
+
+## 答案
+
+```mysql
+select id, dept, name, post 
+from employee
+where dept in ('dev', 'hr');
+```
+
+## 选项
+
+### A
+
+```mysql
+select id, dept, name, post 
+from employee
+where dept in (select 'dev', 'hr');
+```
+
+### B
+
+```mysql
+select id, dept, name, post 
+from employee
+where dept in (select * from 'dev', 'hr');
+```
+
+### C
+
+```mysql
+select id, dept, name, post 
+from employee
+where dept in ('dev' and 'hr');
+```
+
+#### D
+
+```mysql
+select id, dept, name, post 
+from employee
+where dept in ('dev' or 'hr');
+```
diff --git "a/data/2.MySQL\344\270\255\351\230\266/6.\345\255\220\346\237\245\350\257\242/5.NOT EXISTS/config.json" "b/data/2.MySQL\344\270\255\351\230\266/6.\345\255\220\346\237\245\350\257\242/5.NOT EXISTS/config.json"
deleted file mode 100644
index cfa289802fa4c5f6872e8ee6aeea78ff9bf2a3d2..0000000000000000000000000000000000000000
--- "a/data/2.MySQL\344\270\255\351\230\266/6.\345\255\220\346\237\245\350\257\242/5.NOT EXISTS/config.json"	
+++ /dev/null
@@ -1,11 +0,0 @@
-{
-  "node_id": "mysql-19bc57db42bd4615ba4f123745289407",
-  "keywords": [],
-  "children": [],
-  "export": [],
-  "keywords_must": [
-    ["mysql", "not exists"]
-  ],
-  "keywords_forbid": [],
-  "group": 0
-}
\ No newline at end of file
diff --git "a/data/2.MySQL\344\270\255\351\230\266/6.\345\255\220\346\237\245\350\257\242/7. NOT IN/config.json" "b/data/2.MySQL\344\270\255\351\230\266/6.\345\255\220\346\237\245\350\257\242/6. NOT IN/config.json"
similarity index 100%
rename from "data/2.MySQL\344\270\255\351\230\266/6.\345\255\220\346\237\245\350\257\242/7. NOT IN/config.json"
rename to "data/2.MySQL\344\270\255\351\230\266/6.\345\255\220\346\237\245\350\257\242/6. NOT IN/config.json"
diff --git "a/data/2.MySQL\344\270\255\351\230\266/6.\345\255\220\346\237\245\350\257\242/8. \345\210\227\345\255\220\346\237\245\350\257\242/config.json" "b/data/2.MySQL\344\270\255\351\230\266/6.\345\255\220\346\237\245\350\257\242/7. \345\210\227\345\255\220\346\237\245\350\257\242/config.json"
similarity index 100%
rename from "data/2.MySQL\344\270\255\351\230\266/6.\345\255\220\346\237\245\350\257\242/8. \345\210\227\345\255\220\346\237\245\350\257\242/config.json"
rename to "data/2.MySQL\344\270\255\351\230\266/6.\345\255\220\346\237\245\350\257\242/7. \345\210\227\345\255\220\346\237\245\350\257\242/config.json"
diff --git a/data/tree.json b/data/tree.json
index 4980a1739c24f8cd51a1b8c754ff82ae2de7dcc7..7603111d3695b12f2a2d8d26776ba3e3ee63a2f4 100644
--- a/data/tree.json
+++ b/data/tree.json
@@ -1223,21 +1223,6 @@
                       "group": 0
                     }
                   },
-                  {
-                    "NOT EXISTS": {
-                      "node_id": "mysql-19bc57db42bd4615ba4f123745289407",
-                      "keywords": [],
-                      "children": [],
-                      "keywords_must": [
-                        [
-                          "mysql",
-                          "not exists"
-                        ]
-                      ],
-                      "keywords_forbid": [],
-                      "group": 0
-                    }
-                  },
                   {
                     " IN": {
                       "node_id": "mysql-8436069c855c4f1ead7cf11a026e004b",