diff --git a/app/Linebot_handler/Expense.py b/app/Linebot_handler/Expense.py
index 237fc5b..83a15a0 100755
--- a/app/Linebot_handler/Expense.py
+++ b/app/Linebot_handler/Expense.py
@@ -241,15 +241,15 @@ def query_month(line_user_id: str) -> str:
         now = datetime.now()
 
         sql = text("""
-            SELECT 
-                COALESCE(m.display_name, e.item_name) AS display_name, 
+            SELECT
+                COALESCE(m.display_name, e.item_name) AS display_name,
                 SUM(e.amount) as total_amount
             FROM expenses e
-            LEFT JOIN merchant_mapping m ON e.seller_name LIKE '%' || m.pattern || '%'
-            WHERE e.user_id = :user_id 
-              AND EXTRACT(YEAR FROM e.date) = :year 
-              AND EXTRACT(MONTH FROM e.date) = :month
-            GROUP BY display_name
+            LEFT JOIN merchant_mapping m ON e.seller_name LIKE '%%' || m.pattern || '%%'
+            WHERE e.user_id = :user_id
+            AND EXTRACT(YEAR FROM e.date) = :year
+            AND EXTRACT(MONTH FROM e.date) = :month
+            GROUP BY COALESCE(m.display_name, e.item_name)  -- 💡 這裡不能只寫 display_name，要寫完整邏輯
             ORDER BY total_amount DESC
         """)