Question

我陷入了计数问题。任何人都可以查看我的下面的代码并告诉我如何从第一个while循环计数，这是$ query。这里有两列分组，我只想添加另一个列名而不分组只计算行数。像

"SELECT CountryCode,NetID,COUNT(OpCode) as count FROM activecon WHERE OpCode='$thisActiveOp' GROUP BY CountryCode,NetID"

我尝试了以上但我不知道如何使用我的底部代码回显此COUNT（OpCode），我用$ countryValue和$ networkValue回显我的表行。

$query=mysql_query("SELECT CountryCode,NetID FROM activecon WHERE OpCode='$thisActiveOp' GROUP BY CountryCode,NetID") or die(mysql_error());

while($row = mysql_fetch_array($query)) {
    echo "<tr><td>$thisActiveOp</td>";

    $networkID = $row['NetID'];
    $countryID = $row['CountryCode'];


    $query2=mysql_query("SELECT countryName,networkName FROM connection_details WHERE countryId='$countryID' AND netId='$networkID'") or die(mysql_error());
    while($row2 = mysql_fetch_array($query2)) {
        $countryValue = $row2['countryName'];
        $networkValue = $row2['networkName'];
    }
echo "<td>$countryValue</td><td>$networkValue</td></tr>";

}

Answer 1

我认为您建议的代码应该有效，所以它将是：

$query=mysql_query("SELECT CountryCode,NetID,COUNT(OpCode) as code FROM activecon WHERE OpCode='$thisActiveOp' GROUP BY CountryCode,NetID") or die(mysql_error());

while($row = mysql_fetch_array($query)) {
    echo "<tr><td>$thisActiveOp</td>";

    $networkID = $row['NetID'];
    $countryID = $row['CountryCode'];
    $code      = $row['code'];


    $query2=mysql_query("SELECT countryName,networkName FROM connection_details WHERE countryId='$countryID' AND netId='$networkID'") or die(mysql_error());
    while($row2 = mysql_fetch_array($query2)) {
        $countryValue = $row2['countryName'];
        $networkValue = $row2['networkName'];
    }
    echo "<td>$countryValue</td><td>$networkValue</td><td>$code</td></tr>";
}

Answer 2

您可以使用别名来从mysql返回的数组中访问计数。

但是根据数据的详细信息，您的脚本/ sql可能会简化为此（即假设activecon上的每条记录在connection_details上只有1条记录）： -

<?php
$query=mysql_query("SELECT b.countryName, b.networkName, COUNT(a.OpCode) AS `count`
                    FROM activecon a
                    INNER JOIN connection_details b
                    ON a.CountryCode = b.countryId AND a.NetID = b.netId
                    WHERE a.OpCode='".mysq_real_escape_string($thisActiveOp)."' 
                    GROUP BY b.countryName, b.networkName") or die(mysql_error());

while($row = mysql_fetch_array($query)) 
{
    echo "<tr><td>$thisActiveOp</td><td>".$row['countryName']."</td><td>".$row['networkName']."</td><td>".$row['count']."</td></tr>";
}

如何在使用group by时计算列中的行数

2 个答案: