diff --git a/docs/zh/sql/06/biao.md b/docs/zh/sql/06/biao.md
index a0befb2..7cdeb92 100644
--- a/docs/zh/sql/06/biao.md
+++ b/docs/zh/sql/06/biao.md
@@ -17,4 +17,54 @@ priority: 2
 ### 外键
 - 不是当前表的主键
 - 参照了其他表的主键列/与其他表的主键列相对应
-- 他就是当前表的外键
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+- 他就是当前表的外键
+
+### 建表
+
+create table Department
+(
+    表名+类名+数据类型
+)
+
+```sql
+create table Department
+(
+    DepartmentID char(4) primary key,
+    DepartmentName char(4) foreign key references Title(TitleID)
+)
+```
+
+- 主键：primary key
+- 外键：foreign key
+- 唯一键：unique
+- 默认值：default
+
+```sql
+DepartmentName char(4) foreign key references Title(TitleID)
+外键，参照了Title表的TitleID
+简略写法：
+DepartmentName char(4) foreign key(TitleID)
+```
+
+### 创建班级class表
+
+```sql
+create table class
+(
+    ClassID char(8) primary key,
+    ClassDep char(4) foreign key,
+    ClassTeacherID char(10) foreign key,
+    ClassName nvarchar(20) ,
+    Amount int
+)
+```
+
+### 唯一键 样例
+```sql
+ClassName nvarchar(20) unique,
+```
+
+### 默认值 4
+```sql
+ClassName nvarchar(20) default '4',
+```
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