diff --git a/src/CncRepository/Impl/DailyProductionRepository.cs b/src/CncRepository/Impl/DailyProductionRepository.cs
index 447dc0d..3a318a2 100644
--- a/src/CncRepository/Impl/DailyProductionRepository.cs
+++ b/src/CncRepository/Impl/DailyProductionRepository.cs
@@ -130,7 +130,7 @@ namespace CncRepository.Impl
                 string topSql = @"SELECT m.name FROM cnc_daily_production dp LEFT JOIN cnc_machine m ON dp.machine_id = m.id WHERE dp.production_date BETWEEN @Start AND @End";
                 if (workshopId.HasValue) topSql += " AND m.workshop_id = @WorkshopId";
                 topSql += " GROUP BY dp.machine_id ORDER BY SUM(dp.end_total_count - dp.base_total_count) DESC LIMIT 1";
-                result.TopMachineName = conn.ExecuteScalar<string>(topSql, parameters) ?? "";
+                result.TopMachineName = result.TotalQuantity > 0 ? (conn.ExecuteScalar<string>(topSql, parameters) ?? "-") : "-";
                 return result;
             }
         }
@@ -160,7 +160,7 @@ namespace CncRepository.Impl
                 if (result == null) return new WorkerProductionSummaryResponse();
                 if (result.ActiveWorkerCount > 0) result.AvgPerWorker = Math.Round((decimal)result.TotalQuantity / result.ActiveWorkerCount, 1);
                 string topSql = @"SELECT w.name FROM cnc_daily_production dp JOIN cnc_worker_machine wm ON dp.machine_id = wm.machine_id JOIN cnc_worker w ON wm.worker_id = w.id WHERE dp.production_date BETWEEN @Start AND @End GROUP BY w.id, w.name ORDER BY SUM(dp.end_total_count - dp.base_total_count) DESC LIMIT 1";
-                result.TopWorkerName = conn.ExecuteScalar<string>(topSql, new { Start = startDate, End = endDate }) ?? "";
+                result.TopWorkerName = result.TotalQuantity > 0 ? (conn.ExecuteScalar<string>(topSql, new { Start = startDate, End = endDate }) ?? "-") : "-";
                 return result;
             }
         }
@@ -194,7 +194,7 @@ namespace CncRepository.Impl
                 string topSql = @"SELECT dp.program_name FROM cnc_daily_production dp LEFT JOIN cnc_machine m ON dp.machine_id = m.id WHERE dp.production_date BETWEEN @Start AND @End";
                 if (workshopId.HasValue) topSql += " AND m.workshop_id = @WorkshopId";
                 topSql += " GROUP BY dp.program_name ORDER BY SUM(dp.end_total_count - dp.base_total_count) DESC LIMIT 1";
-                result.TopProgramName = conn.ExecuteScalar<string>(topSql, parameters) ?? "";
+                result.TopProgramName = result.TotalQuantity > 0 ? (conn.ExecuteScalar<string>(topSql, parameters) ?? "-") : "-";
                 return result;
             }
         }