diff --git a/docs/.vuepress/config.js b/docs/.vuepress/config.js
index cd12b86..f24eb6d 100644
--- a/docs/.vuepress/config.js
+++ b/docs/.vuepress/config.js
@@ -3,6 +3,7 @@ module.exports = {
     description: '测试',
  
     themeConfig: {
+      search:false,
       sidebarDepth:2,
         sidebar: 'auto',
         nav: [
@@ -14,7 +15,8 @@ module.exports = {
                 'install',  /* /foo/one.html */
                 'create',   /* /foo/two.html */
                 'insert',
-                'update'
+                'update',
+                'delete'
               ] ,
           '/': [
             '',        /* / */
diff --git a/docs/README.md b/docs/README.md
index fed951c..6461892 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -1,16 +1 @@
----
-home: true
-heroImage: /hero.png
-heroText: Hero 标题
-tagline: Hero 副标题
-actionText: 快速上手 →
-actionLink: /zh/guide/
-features:
-- title: 简洁至上
-  details: 以 Markdown 为中心的项目结构，以最少的配置帮助你专注于写作。
-- title: Vue驱动
-  details: 享受 Vue + webpack 的开发体验，在 Markdown 中使用 Vue 组件，同时可以使用 Vue 来开发自定义主题。
-- title: 高性能
-  details: VuePress 为每个页面预渲染生成静态的 HTML，同时在页面被加载的时候，将作为 SPA 运行。
-footer: MIT Licensed | Copyright © 2018-present Evan You
----
\ No newline at end of file
+# 测试课程教案
diff --git a/docs/mysql/delete.md b/docs/mysql/delete.md
new file mode 100644
index 0000000..b9d4037
--- /dev/null
+++ b/docs/mysql/delete.md
@@ -0,0 +1,49 @@
+# 删除数据
+
+> mysql删除是使用delete语句
+
+## delete
+
+删除语法其实是非常简单的，但是也是比较危险的，需要慎重操作。
+
+```sql
+delete from table [where ];
+```
+
+最简单的删除语句是
+
+```sql
+delete from tablename;
+```
+
+但是不要这么操作，他会像修改时候一样，全部删除掉，所以操作删除的时候一定要添加条件
+
+```sql
+delete from tablename where 条件;
+```
+
+还是之前的class表。
+
+![图 1](../../images/c486c8a54c50d5f9eb96c1e14ba76b5b069fe4055c8eb57f0a5c2d9a945639bc.png)  
+
+比如我要删除姓名为张三的人，应该怎么删除呢？
+
+```sql
+delete from class where name = "张三";
+```
+
+![图 2](../../images/60aac5dbd2c221fcb19925284ebd621b59a08ac3d88115a8572a294483e85992.png)  
+
+删除成功了，然后查询之后张三就没有了。
+
+比如要删除年龄是18的人，那么应该就是 `where age = 18`
+
+```sql
+delete from class where age = 18;
+```
+
+![图 3](../../images/78eb44abb4fa3770f2ca3f9f064f8e6846e3b21f28044ce872f880346d438776.png)  
+
+成功删除了，删除了所有年龄是18的人。
+
+删除是比较简单的操作，接下来就要来看一下主键。
\ No newline at end of file
diff --git a/docs/mysql/primaryKey.md b/docs/mysql/primaryKey.md
new file mode 100644
index 0000000..faecae5
--- /dev/null
+++ b/docs/mysql/primaryKey.md
@@ -0,0 +1,17 @@
+# 主键
+
+> 在之前的操作中我们进行了增删改查，并没有出现什么问题，但是有一个很大的问题，前面的姓名。年龄，性别都是有可能重复的，我们没有办法准确的确定到一个人，比如下面这种情况。
+
+## primary key
+
+先看一下现在表中的数据。
+
+![图 4](../../images/4874f36184f21487e8bf5a353f8c9416d2db19b3f37dc98ab1687afceac80ac3.png)  
+
+现在表中还有李四和小名这两个人，但是这个班级中又来了一个转校生，名字也叫李四，性别也是男，但是年龄是21。
+
+先添加这么一个人
+
+```sql
+insert into class(name,sex,age) value("李四","男",21);
+```
diff --git a/docs/mysql/update.md b/docs/mysql/update.md
index 5fec530..483eccf 100644
--- a/docs/mysql/update.md
+++ b/docs/mysql/update.md
@@ -1,8 +1,8 @@
-# 数据操作
+# 修改数据
 
 > 之前已经看到了查询数据与添加数据，下面来看一下修改数据
 
-## 修改数据
+## update
 
 修改数据也有自己的另一个语法。
 
@@ -80,7 +80,7 @@ set 后面跟上修改的字段名=值，然后用逗号隔开 `,`
 update class set sex="男",age=10 where name="李四";
 ```
 
-执行一下 
+执行一下
 
 ![图 15](../../images/bb17eb99a1330e324b3e220d2128ec8c0a354311bc573b25207125e79b73b27f.png)  
 
diff --git a/images/4874f36184f21487e8bf5a353f8c9416d2db19b3f37dc98ab1687afceac80ac3.png b/images/4874f36184f21487e8bf5a353f8c9416d2db19b3f37dc98ab1687afceac80ac3.png
new file mode 100644
index 0000000..af65630
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diff --git a/images/60aac5dbd2c221fcb19925284ebd621b59a08ac3d88115a8572a294483e85992.png b/images/60aac5dbd2c221fcb19925284ebd621b59a08ac3d88115a8572a294483e85992.png
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index 0000000..da8ac2a
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diff --git a/images/78eb44abb4fa3770f2ca3f9f064f8e6846e3b21f28044ce872f880346d438776.png b/images/78eb44abb4fa3770f2ca3f9f064f8e6846e3b21f28044ce872f880346d438776.png
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index 0000000..2ed1ef9
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diff --git a/images/c486c8a54c50d5f9eb96c1e14ba76b5b069fe4055c8eb57f0a5c2d9a945639bc.png b/images/c486c8a54c50d5f9eb96c1e14ba76b5b069fe4055c8eb57f0a5c2d9a945639bc.png
new file mode 100644
index 0000000..564c5e1
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diff --git a/package.json b/package.json
index 1c90cee..8fed69b 100644
--- a/package.json
+++ b/package.json
@@ -10,4 +10,4 @@
     "dev": "vuepress dev docs",
     "build": "vuepress build docs"
   }
-}
\ No newline at end of file
+}
diff --git a/yarn.lock b/yarn.lock
index 80341ee..f0f9b70 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -3631,6 +3631,11 @@ glob-to-regexp@^0.3.0:
   resolved "https://registry.yarnpkg.com/glob-to-regexp/-/glob-to-regexp-0.3.0.tgz#8c5a1494d2066c570cc3bfe4496175acc4d502ab"
   integrity sha1-jFoUlNIGbFcMw7/kSWF1rMTVAqs=
 
+glob-to-regexp@^0.4.1:
+  version "0.4.1"
+  resolved "https://registry.npm.taobao.org/glob-to-regexp/download/glob-to-regexp-0.4.1.tgz#c75297087c851b9a578bd217dd59a92f59fe546e"
+  integrity sha1-x1KXCHyFG5pXi9IX3VmpL1n+VG4=
+
 glob@^7.0.3, glob@^7.1.2, glob@^7.1.3, glob@^7.1.4, glob@^7.1.6:
   version "7.1.6"
   resolved "https://registry.yarnpkg.com/glob/-/glob-7.1.6.tgz#141f33b81a7c2492e125594307480c46679278a6"
@@ -7651,6 +7656,14 @@ watchpack@^1.7.4:
     chokidar "^3.4.1"
     watchpack-chokidar2 "^2.0.1"
 
+watchpack@^2.1.1:
+  version "2.1.1"
+  resolved "https://registry.nlark.com/watchpack/download/watchpack-2.1.1.tgz#e99630550fca07df9f90a06056987baa40a689c7"
+  integrity sha1-6ZYwVQ/KB9+fkKBgVph7qkCmicc=
+  dependencies:
+    glob-to-regexp "^0.4.1"
+    graceful-fs "^4.1.2"
+
 wbuf@^1.1.0, wbuf@^1.7.3:
   version "1.7.3"
   resolved "https://registry.yarnpkg.com/wbuf/-/wbuf-1.7.3.tgz#c1d8d149316d3ea852848895cb6a0bfe887b87df"