1

Question

嗨，大家好我有这个查询，而且速度超慢。如果您能理解代码，我怎么可能将两个查询合并为一个或者我怎样才能更快地进行此查询。

这是代码

$strSQL  = "SELECT user_status_history.*, queues_config.extension FROM user_status_history ";
    $strSQL .= "LEFT JOIN queues_config ON user_status_history.skillset = REPLACE(queues_config.grppre, \":\", \"\") ";
    $strSQL .= "WHERE user_status_history.status_id = 9 "; # outbound call
    $strSQL .= "AND DATE_FORMAT(status_time, '%Y-%m-%d') = '$check_date' ";
    if ($i==1)
        $strSQL .= "AND TIME_FORMAT(status_time, '%H:%i') >= '$cboHrFrom:$cboMinFrom' ";
    else if (strtotime($check_date) == strtotime($end_date))
        $strSQL .= "AND TIME_FORMAT(status_time, '%H:%i') <= '$cboHrTo:$cboMinTo' ";
    $strSQL .= "AND queues_config.extension = '$cboSkillSet' ";
    if ($cboGroup!='' && $strAgentGroup!='') $strSQL .= "AND user_status_history.user_id IN (".$strAgentGroup.") ";
    $strSQL .= "ORDER BY user_status_history.user_id, user_status_history.status_time ";
    $rs2     = &$cn->Execute($strSQL);
    while (!$rs2->EOF)
    {
        $strSQL  = "SELECT status_time, time_to_sec(timediff(status_time, '".$rs2->fields['status_time']."')) AS timesecs FROM user_status_history ";
        $strSQL .= "LEFT JOIN queues_config ON user_status_history.skillset = REPLACE(queues_config.grppre, \":\", \"\") ";
        $strSQL .= "WHERE status_time > '".$rs2->fields['status_time']."' ";
        $strSQL .= "AND user_id = '".$rs2->fields['user_id']."' ";
        $strSQL .= "AND queues_config.extension = '".$rs2->fields['extension']."' ";
        $strSQL .= "ORDER BY status_time LIMIT 1;";
        $rs3     = &$cn->Execute($strSQL);
        if (!$rs3->EOF)
        {
            $sum_talk_sec = $sum_talk_sec + $rs3->fields['timesecs'];
        }
        $rs3->Close();

        $rs2->MoveNext();
    }
    $rs2->Close();

Answer 1

1

查看

的表索引

user_status_history.status_id

user_status_history.user_id

2

这些对于优化器来说很难。试着摆脱这些

LEFT JOIN queues_config ON user_status_history.skillset = REPLACE(queues_config.grppre, \":\", \"\") ";
LEFT JOIN queues_config ON user_status_history.skillset = REPLACE(queues_config.grppre, \":\", \"\") ";

3

摆脱循环查询。从query1获取所有ID到数组并为它们创建一个查询：

“SELECT user_id，status_time，time_to_sec（timediff（status_time，'”。$ rs2-＆gt; fields ['status_time']。“'））AS timesecs FROM user_status_history”; ... AND user_id IN（id1，id2，id3 ...）

4（来自DCOder）

反过来转换这些。使用PHP创建mysql datetime字段。

    $strSQL .= "AND DATE_FORMAT(status_time, '%Y-%m-%d') = '$check_date' ";

-- > 
    preg_match('/^([0-9][0-9][0-9][0-9])-([0-9][0-9])-([0-9][0-9])$/', $check_date, $regs );
    $enddate = date('Y-m-d', mktime( $hour=6, $min=0, $sec=0, $mon=$regs[2], $day=$regs[3]+1, $year=$regs[1] ));
    $strSQL .= " AND status_time > '$check_date' AND status_time <= '$enddate' ; 


    $strSQL .= "AND TIME_FORMAT(status_time, '%H:%i') >= '$cboHrFrom:$cboMinFrom' ";

-- >  $strSQL .= " AND status_time >= '$check_date $cboHrFrom:$cboMinFrom:00' ";

    $strSQL .= "AND TIME_FORMAT(status_time, '%H:%i') <= '$cboHrTo:$cboMinTo' ";

-- >  $strSQL .= " AND status_time <= '$check_date $cboHrTo:$cboMinTo:59' ";

查询改进mysql

1 个答案:

1

2

3

4（来自DCOder）