Question

我的查询如下：

$result_portlist=mysql_query("
    SELECT 
        portfolio AS the_port,
        SUM(balance * course) AS the_balance,
        SUM(insurance * course) AS the_insurance
        FROM banks_all 
    WHERE CONCAT(balance, insurance)!='0'
    GROUP BY portfolio
    ",$db);

$myrow_portlist=mysql_fetch_array($result_portlist); 
if(mysql_num_rows($result_portlist)>0) { 
    do { 
        echo '<span> value1, vaule2, value3...</span>';

        $result_portlist1=mysql_query("
            SELECT 
                department AS the_department,
                SUM(balance * course) AS the_balance,
                SUM(insurance * course) AS the_insurance
            FROM banks_all 
            WHERE CONCAT(balance, insurance)!='0'
                AND portfolio='$myrow_portlist[the_port]' 
            GROUP BY department
        ",$db);

        $myrow_portlist1=mysql_fetch_array($result_portlist1); 
        if (mysql_num_rows($result_portlist1)>0) { 
            do { 
                echo '<span> value1, vaule2, value3...</span>'

                $result_portlist2=mysql_query("
                    SELECT 
                        manager_name AS the_manager,
                        SUM(balance * course) AS the_balance,
                        SUM(insurance * course) AS the_insurance
                    FROM banks_all
                    WHERE CONCAT(balance, insurance)!='0'
                        AND portfolio='$myrow_portlist[the_port]' 
                        AND department='$myrow_portlist1[the_department]'
                    GROUP BY manager_name
                ",$db);

                { 
                    do {
                        echo '<span> value1, vaule2, value3...</span>';
                    } while ($myrow_portlist2=mysql_fetch_array($result_portlist2));
                } 
            } while ($myrow_portlist1=mysql_fetch_array($result_portlist1)); 
        } 
    } while ($myrow_portlist1=mysql_fetch_array($result_portlist1)); 
}

因此，对于包含40,000多行且包含portfolio + department + manager_name的数百种组合的表，此查询需要数小时才能执行。我的想法是在开始时进行一个查询，将manager_name分组，然后让php组portfolio和department。在创建了这个查询之后，我的思绪刚刚爆炸，没有剩下的空闲内存可以思考：）

请建议我如何重新排列此查询或如何简化它以减少执行时间。

提前致谢。

编辑：这是图像，我的表（嵌套表格）如何：

IMAGE

Answer 1

之所以花费大量时间，是因为您正在执行大量查询...假设您有10个投资组合，在10个部门中，您可以进行100次查询。这个金额是疯狂的，在你的情况下减少查询的数量非常简单。

我只是在一个查询中获取所有数据，并通过汇总使用3级组：

$result=mysql_query("
    SELECT 
        portfolio AS the_port,
        department AS the_department,
        manager_name AS the_manager,
        SUM(balance * course) AS the_balance,
        SUM(insurance * course) AS the_insurance
    FROM banks_all 
    WHERE 
        CONCAT(balance, insurance)!='0'
    GROUP BY 
        portfolio,
        department,
        manager_name 
    with ROLLUP
    ORDER BY the_port,the_department,the_manager;
",$db);
echo '<table>';
while($row = mysql_fetch_assoc($result)){
    if($row['the_port'] === null){
        //This is the big total row... Let's skip it for now shall we?
        continue;
    }
    echo '<tr>';
    if($row['the_department'] === null){
        echo '<td>Portfolio: '.$row['the_port'].'</td>';
    }else{
        if($row['the_manager'] === null){
            echo '<td>Department: '.$row['the_port'].'</td>';
        }else{
            echo '<td>Manager: '.$row['the_port'].'</td>';
        }
    }
    echo '<td>'.$row['the_balance'].'</td>';
    echo '<td>'.$row['the_insurance'].'</td>';
    echo '</tr>';
}
echo '</table>';

此查询将返回按产品组合分组的所有行，然后按部门分组，然后按经理分组。这将从最精细的点（第三次）返回所有行，但是使用ROLLUP，您还将按级别为另一个组获取一行。这就像您在同一查询中完成GROUP BY portfolio,department和GROUP BY portfolio一样。

在汇总的行中，group by中省略的键的值将为NULL。因此，您可以轻松查看the_manager，当它为空时表示您拥有完整的部门，当the_department为空时您拥有完整的投资组合。

花很长时间执行复杂的mySql查询

1 个答案: