Mysql 查询发布日期减去 7 天

这不断出现错误，我不明白为什么......

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

带有消息的异常“CDbException”

CDbCommand 无法执行 SQL 语句： CDbCommand 无法准备 SQL 语句： SQLSTATE[HY000]：一般错误：“7”附近 1：语法错误。

执行的SQL语句是：

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;
    }

}

?>

我无法解释这个问题，但你可以消除表达式中的子查询。也许这会有所帮助：

        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