diff --git a/internal/dao/sensor.go b/internal/dao/sensor.go
index f487526..93305e2 100644
--- a/internal/dao/sensor.go
+++ b/internal/dao/sensor.go
@@ -56,27 +56,18 @@ func (dao *SensorDAO) GetAggregatedData(start, end time.Time, interval string) (
 
 	// 使用子查询和时间桶来实现聚合
 	query := `
-		WITH time_buckets AS (
-			SELECT 
-				DATE_FORMAT(
-					DATE_SUB(timestamp, INTERVAL MOD(MINUTE(timestamp), ?) MINUTE), 
-					'%Y-%m-%dT%H:%i:00'
-				) AS bucket_time,
-				AVG(temperature) AS temp,
-				MAX(rainfall) - MIN(rainfall) AS rain,
-				AVG(humidity) AS hum,
-				AVG(wind_speed) AS wind
-			FROM sensor_data
-			WHERE timestamp BETWEEN ? AND ?
-			GROUP BY bucket_time
-		)
 		SELECT 
-			bucket_time, 
-			ROUND(temp/10, 1) AS avg_temp,
-			rain AS rainfall,
-			ROUND(hum/10, 1) AS avg_humidity,
-			ROUND(wind/10, 1) AS avg_wind_speed
-		FROM time_buckets
+			DATE_FORMAT(
+				DATE_SUB(timestamp, INTERVAL MOD(MINUTE(timestamp), ?) MINUTE), 
+				'%Y-%m-%dT%H:%i:00'
+			) AS bucket_time,
+			ROUND(AVG(temperature)/10, 1) AS avg_temp,
+			MAX(rainfall) - MIN(rainfall) AS rainfall,
+			ROUND(AVG(humidity)/10, 1) AS avg_humidity,
+			ROUND(AVG(wind_speed)/10, 1) AS avg_wind_speed
+		FROM sensor_data
+		WHERE timestamp BETWEEN ? AND ?
+		GROUP BY bucket_time
 		ORDER BY bucket_time DESC
 	`