diff --git a/api/student.py b/api/student.py
index 9299659..99daec7 100644
--- a/api/student.py
+++ b/api/student.py
@@ -6,7 +6,7 @@ from schemas.student import StudentCreate
 student_router = APIRouter()
 
 @student_router.post("/student")
-def create_student(request:StudentCreate,db:Session,create = Depends(create_students)):
+def create_student(request:StudentCreate,db:Session=Depends(create_students)):
     d = request.model_dump()
     r = create_students(d,db)
     if not r:
diff --git a/dao/statistics.py b/dao/statistics.py
index a01a1ae..ddaaa2e 100644
--- a/dao/statistics.py
+++ b/dao/statistics.py
@@ -5,36 +5,60 @@ from time import time
 #查询所有超过 30 岁的学员信息
 
 def age_over_thirty(Student,db):
-    student_list=db.query(Student).filter(Student.age>30,Student.is_delted==0).all()
+    student_list=db.query(Student).filter(Student.age>30,Student.is_deleted==0).all()
     if not student_list :
         raise NoExist('无目标年龄大于30岁')
-    return student_list
+    # 把每个学生对象需要返回的字段，明确放进普通字典。
+    result = []
+    for student in student_list:
+        result.append({
+            "id": student.id,
+            "student_no": student.student_no,
+            "student_name": student.student_name,
+            "class_id": student.class_id,
+            "consultant_id": student.consultant_id,
+            "native_place": student.native_place,
+            "graduation_school": student.graduation_school,
+            "major": student.major,
+            "enrollment_date": student.enrollment_date,
+            "graduation_date": student.graduation_date,
+            "education": student.education,
+            "age": student.age,
+            "gender": student.gender,
+            "create_at": student.create_at,
+            "update_at": student.update_at,
+            "is_deleted": student.is_deleted,
+        })
+    return result
 
 def gender_count(Student,db):
     result=db.query(Student.class_id,Student.gender,func.count(Student.id)).filter(Student.is_deleted==0).group_by(Student.class_id,Student.gender).all()
     if not result :
         raise NoExist('班里招点人吧，要倒闭了')
     dict1 = {}
-    sum_stu = 0
     for i,j,k in result:
         if i not in dict1 :
-            dict1[i]={'男':0,'女':0}
+            dict1[i]={'男':0,'女':0,'总人数':0}
         dict1[i][j]+=k
-        sum_stu+=k
-    dict1['总人数'] = sum_stu
+        dict1[i]['总人数']+=k
     return dict1
 #查询每次考试成绩都在 80 分以上的学生编号、姓名和成绩
 def score_over_eighty(Score,Student,db):
     student_list=db.query(Student.id, Student.student_name)\
-                  .join(Score,Score.student_id==Student.id).filter(Student.is_deleted==0,Score.is_deleted==0).group_by(Student.student_id,Student.student_name)\
+                  .join(Score,Score.student_id==Student.id).filter(Student.is_deleted==0,Score.is_deleted==0).group_by(Student.id,Student.student_name)\
                   .having(func.min(Score.score)>80).all()
     if not student_list :
         raise NoExist('全是学渣')
     list1 = []
     for i in student_list:
-        student_list2 = db.query(Student.student_no, Student.student_name,Score.score).join(Score,Score.student_id==Student.id).filter(i.id==Student.id).all()
+        student_list2 = db.query(Student.student_no, Student.student_name,Score.score).join(Score,Score.student_id==Student.id).filter(i.id==Student.id,Score.is_deleted==0).all()
         if student_list2 :
-            list1.extend(student_list2)
+            for student_no, student_name, score in student_list2:
+                list1.append({
+                    "student_no": student_no,
+                    "student_name": student_name,
+                    "score": float(score) if score is not None else None,
+                })
     return list1
 #查询有两次以上不及格的学生姓名、班级和不及格成绩
 def twice_error(Score,Student,db):
@@ -45,7 +69,12 @@ def twice_error(Score,Student,db):
     for i in student_list:
         result=db.query(Student.student_name,Student.class_id,Score.score).join(Score, Student.id==Score.student_id)\
         .filter(i.student_id==Score.student_id,Score.score<60,Student.is_deleted==0,Score.is_deleted==0).all()
-        list1.extend(result)
+        for student_name, class_id, score in result:
+            list1.append({
+                "student_name": student_name,
+                "class_id": class_id,
+                "score": float(score) if score is not None else None,
+            })
     return list1
 
 #统计每次考试每个班级的平均分，并按照平均分从高到低排序
@@ -53,20 +82,41 @@ def avg_class(Score,Student,db):
     student_list = db.query(Student.class_id,Score.exam_seq,func.avg(Score.score)).join(Score, Student.id == Score.student_id).filter(Score.is_deleted==0,Student.is_deleted==0).group_by(Student.class_id,Score.exam_seq).order_by(func.avg(Score.score).desc()).all()
     if not student_list :
         raise NoExist('招个人吧')
-    return student_list
+    result = []
+    for class_id, exam_seq, average_score in student_list:
+        result.append({
+            "class_id": class_id,
+            "exam_seq": exam_seq,
+            "average_score": float(average_score) if average_score is not None else None,
+        })
+    return result
 
 #统计就业薪资最高的前五名学生姓名、班级、就业时间、就业公司
 def max_salary(Student,Employment,db):
     student_list = db.query(Student.student_name,Student.class_id,Employment.offer_date,Employment.company_name).join(Employment, Student.id == Employment.student_id).filter(Student.is_deleted==0,Employment.is_deleted==0).order_by(Employment.salary.desc()).limit(5).all()
     if not student_list :
         raise NoExist('没就业的啊兄弟？')
-    return student_list
+    result = []
+    for student_name, class_id, offer_date, company_name in student_list:
+        result.append({
+            "student_name": student_name,
+            "class_id": class_id,
+            "offer_date": offer_date,
+            "company_name": company_name,
+        })
+    return result
 
 # - 统计每个学生的就业时长
 # - 就业时长 = `offer_date - employment_open_date`
 def student_market(Employment,db):
     student_list = db.query(Employment.student_id,func.datediff(Employment.offer_date,Employment.employment_open_date)).filter(Employment.is_deleted==0).all()
-    return student_list
+    result = []
+    for student_id, duration_days in student_list:
+        result.append({
+            "student_id": student_id,
+            "duration_days": duration_days,
+        })
+    return result
 
 # - 统计每个班级的平均就业时长
 # - 只统计有就业开放时间的学生
@@ -77,7 +127,13 @@ def avg_emptime(Employment,Student,db):
     .group_by(Student.class_id).all()
     if not student_list :
         raise NoExist('一个就业都没有吗')
-    return student_list
+    result = []
+    for class_id, average_days in student_list:
+        result.append({
+            "class_id": class_id,
+            "average_days": float(average_days) if average_days is not None else None,
+        })
+    return result
 
 
 
diff --git a/models/class_model.py b/models/class_model.py
index 50ff873..dc6ce4a 100644
--- a/models/class_model.py
+++ b/models/class_model.py
@@ -35,7 +35,7 @@ class Classes( Base ):              # 在python里的名字
                        , nullable = False         # 声明是"非空"
                        )
     # ————创建班级"更新时间"的字段名————
-    updated_at = Column( DATETIME         # 声明是字段数据类型是"日期时间"
+    update_at = Column( DATETIME         # 声明是字段数据类型是"日期时间"
                        , default=datetime.now  #声明是第一次更新的时间就是第一次创建的时间一致
                        , onupdate=datetime.now   # 声明"最后修改的时间"
                        , server_default=text("CURRENT_TIMESTAMP ON UPDATE CURRENT_TIMESTAMP")