diff --git a/PythonProject/dao/statistics_dao.py b/PythonProject/dao/statistics_dao.py
index bb9c068..de2fd06 100644
--- a/PythonProject/dao/statistics_dao.py
+++ b/PythonProject/dao/statistics_dao.py
@@ -1,6 +1,8 @@
+from datetime import datetime
+
 from fastapi import HTTPException,Depends
 from sqlalchemy import func
-from model.all_model import Student_Model,WlScore
+from model.all_model import Student_Model,WlScore,Employment_info
 from util.database import get_db
 
 # 实现根据年龄查询学生信息的功能
@@ -43,4 +45,17 @@ def select_score(min_score,max_score,session=Depends(get_db)):
     except HTTPException:
         raise
     except Exception:
-        raise HTTPException(status_code=500,detail="查询异常")
\ No newline at end of file
+        raise HTTPException(status_code=500,detail="查询异常")
+
+#实现查询每个学生的就业时长
+def select_emp_duration(stu_id:int,session):
+    try:
+       l2 = session.query(Employment_info,Student_Model.name.label('stu_name'),).join(Student_Model,stu_id==Student_Model.stu_id).filter(Employment_info.stu_id == stu_id,Employment_info.delete_status == 0).all()
+       list=[]
+       today=datetime.today()
+       for i in l2:
+          duration_days = (today - i.start_date).days
+       list.append({Employment_info.stu_id:i.stu_id,
+
+                    Employment_info.offer_issuance_date:i.offer_issuance_date,
+                    Employment_info.company_name:i.company_name})