MySQL查詢發行日期減去7天

Question

這使得未來與一個錯誤，我無法弄清楚，爲什麼...

SELECT 
    i.user_id 
FROM (SELECT 
    SUM(us.score) AS score_sum, 
    us.user_id 
     FROM user_scores us 
     WHERE us.created >= DATE(DATE_SUB(NOW(),INTERVAL 7 DAY)) 
     GROUP BY us.user_id) AS i 
ORDER BY i.score_sum 
LIMIT 1 

異常「CDbException」有消息

CDbCommand failed to execute the SQL statement: CDbCommand failed to prepare the SQL statement: SQLSTATE[HY000]: General error: 1 near "7": syntax error.

的SQL語句執行是：

SELECT 
    i.user_id 
FROM (SELECT 
    SUM(us.score) AS score_sum, 
    us.user_id 
     FROM user_scores us 
     WHERE us.created >= DATE(DATE_SUB(NOW(),INTERVAL 7 DAY)) 
     GROUP BY us.user_id) AS i 
ORDER BY i.score_sum 
LIMIT 1 



<?php 

class WinnerCommand extends CConsoleCommand 
{ 
    public function actionSelect() 
    { 
     $sql = "SELECT i.user_id FROM 
      (SELECT SUM(us.score) AS score_sum, us.user_id FROM user_scores us 
      WHERE us.created >= DATE(DATE_SUB(NOW(),INTERVAL 7 DAY)) 
      GROUP BY us.user_id) AS i 
      ORDER BY i.score_sum 
      LIMIT 1"; 
     $user_id = Yii::app()->db->createCommand($sql)->queryScalar(); 
     echo $user_id; 
     return $user_id; 
    } 

}

？>

Answer 1

我無法解釋問題，但可以消除表達式中的子查詢。也許這將有助於：

 SELECT us.user_id 
     FROM user_scores us 
     WHERE us.created >= DATE(DATE_SUB(NOW(), INTERVAL 7 DAY)) 
     GROUP BY us.user_id) 
     ORDER BY SUM(us.score) 
     LIMIT 1