mrz

PythonProject/dao/statistics_dao.py

@@ -124,18 +124,11 @@ def select_avg_days(db):
 #统计每个学⽣的就业时⻓
 def select_days(db):
     try:
-        l2 =db.query(
-                     Employment_info.stu_id
-                    ,Employment_info.employment_opening_date
-                    ,Employment_info.offer_issuance_date
-                       ,func.datediff(
-                                      Employment_info.offer_issuance_date
-                                     ,Employment_info.employment_opening_date
-                                     )
-                      .label("employment_duration_day")
-                    ).filter(
-                             Employment_info.delete_status == 0
-                             ).all()
+        l2 =db.query(Employment_info.stu_id
+                    ,func.coalesce(func.datediff(Employment_info.offer_issuance_date
+                                   ,Employment_info.employment_opening_date),0)\
+                     .label("diff_days")
+                     ).filter(Employment_info.delete_status == 0).all()
         return l2
     except Exception:
         raise HTTPException(status_code=500, detail="查询异常")