2

我有一张桌子，我需要从中获取联系人。所以我使用一个复杂的查询来从我的“sms”表中检索所有的联系人。

但是，它应该只计算提供的“imei”字段的记录，但我的查询会不断返回特定联系人的所有计数。

下面是使用的代码：

$sql = $this->db->query('
    SELECT 
        t1.mnumber AS t1_number, t1.mcontent AS t1_content, t1.mcontact as t1_contact, SUM(t2.TOTAL) AS mTotal
    FROM
        sms t1
            JOIN
        (SELECT 
            mContent, mcontact, COUNT(mNumber) AS TOTAL, mnumber, MAX(mID) mID
        FROM
            sms
        GROUP BY mContact) t2 ON t1.mcontact = t2.mcontact
            AND t1.mid = t2.mid
        WHERE t1.mIMEI = ' . (IMEI) . '
        GROUP BY t1.mContact
        ORDER BY t1.mid DESC');

    return $sql->result();
4

3 回答 3

2

格式更好，查询是：

SELECT t1.mnumber AS t1_number, t1.mcontent AS t1_content, t1.mcontact as t1_contact, SUM(t2.TOTAL) AS mTotal
FROM sms t1 JOIN
     (SELECT mContent, mcontact, COUNT(mNumber) AS TOTAL, mnumber, MAX(mID) mID
      FROM sms
      GROUP BY mContact
     ) t2
     ON t1.mcontact = t2.mcontact AND t1.mid = t2.mid
WHERE t1.mIMEI = ' . (IMEI) . '
GROUP BY t1.mContact
ORDER BY t1.mid DESC

问题是该where子句放错了地方。要让它影响计数，您需要在子查询中使用它。要让它影响输出行，您需要在外部查询中使用它。我会建议：

SELECT t1.mnumber AS t1_number, t1.mcontent AS t1_content, t1.mcontact as t1_contact, SUM(t2.TOTAL) AS mTotal
FROM sms t1 JOIN
     (SELECT mContent, mcontact, COUNT(mNumber) AS TOTAL, mnumber, MAX(mID) as maxmid
      FROM sms
      WHERE sms.mIMEI = ' . (IMEI) . '
      GROUP BY mContact
     ) t2
     ON t1.mcontact = t2.mcontact AND t1.mid = t2.maxmid
GROUP BY t1.mContact
ORDER BY t1.mid DESC

我怀疑可能还有其他简化，这取决于数据库结构的含义mid和mcontact含义。

于 2013-05-09T15:32:47.947 回答
0

您在两个语句中都需要该WHERE子句SELECT。

SELECT t1.mnumber AS t1_number, t1.mcontent AS t1_content, t1.mcontact as t1_contact, SUM(t2.TOTAL) AS mTotal
FROM sms t1 JOIN
     (SELECT mContent, mcontact, COUNT(mNumber) AS TOTAL, mnumber, MAX(mID) mID
      FROM sms
      WHERE mIMEI = ' . (IMEI) . '
      GROUP BY mContact
     ) t2
     ON t1.mcontact = t2.mcontact AND t1.mid = t2.mid
WHERE t1.mIMEI = ' . (IMEI) . '
GROUP BY t1.mContact
ORDER BY t1.mid DESC

如果在这两个地方都没有该WHERE子句，您将加入与mContact. 即使是那些不符合你t1.mIMEI = ' . (IMEI) . '条件的。

于 2013-05-09T17:41:14.850 回答
0

@Gordon Linoff 给出的答案是正确的。然而真正的问题在于表格本身。

它存储所有消息，但有时“mNumber”是国际电话号码，有时是用户将其存储到手机的格式。

因此，当我使用“mNumber”字段加载“mContent”时，它只会给我一个部分结果！！

所以还在寻找解决方案吗？也许是多个 WHERE 分句？

于 2013-05-10T10:45:59.620 回答