diff --git a/2207/MySQL数据库操作综合练习题答案.md b/2207/MySQL数据库操作综合练习题答案.md
index ac6c2ce..cf7272b 100644
--- a/2207/MySQL数据库操作综合练习题答案.md
+++ b/2207/MySQL数据库操作综合练习题答案.md
@@ -298,6 +298,26 @@ VALUES
 ![image-20250315225829272](https://yp.smallkun.cn/markdown/image-20250315225829272.png!compress)
 
 ```sql
+#4
+SELECT *
+FROM teacher;
+#5
+SELECT t.number '教工号', d.depName '部门名称'
+FROM teacher t, department d
+WHERE t.depNo = d.depNo AND t.address LIKE '%北京%';
+#6
+SELECT t.number, t.`name`
+FROM teacher t
+ORDER BY t.salary DESC
+LIMIT 1;
+#7
+SELECT t.number, t.`name`
+FROM teacher t
+WHERE t.salary BETWEEN 2500 AND 4000;
+#8
+SELECT t.`name`, t.sex, t.salary
+FROM teacher t, department d
+WHERE t.depNo = d.depNo AND d.depName = '网络技术系';
 ```
 
 ---