Question

我需要我的电脑游戏从用户的总数中获取所有杀戮和死亡，然后使其杀死除以死亡，然后将总数放在最后。这个比率被称为杀死率，或者说是KDR＆＃34;。

 <?php
   // Create connection
   $con=mysqli_connect("ipaddress","user","password","minecraft");

   // Check connection
   if (mysqli_connect_errno()) {
     echo "Failed to connect to MySQL: " . mysqli_connect_error();
   }
   $result = mysqli_query($con,"SELECT *, `kills`/`deaths` as `KDR` FROM war_kills ``ORDER BY kills DESC");




   echo "<table border='1'>
   <tr>
   <th>Player</th>
   <th>Kills</th>
   <th>Deaths</th>
   <th>KDR</th>
   </tr>";

   while($row = mysqli_fetch_array($result)) {
     echo "<tr>";
     echo "<td>" . $row['player'] . "</td>";
     echo "<td>" . $row['kills'] . "</td>";
     echo "<td>" . $row['deaths'] . "</td>";
     echo "<td>" . $row['KDR'] . "</td>";

     echo "</tr>";
   }

   echo "</table>";
   ?>

到目前为止，我们已经解决了这个问题：http://gexgaming.com/warstats/index.php

Answer 1

从

更改查询

SELECT player, kills, deaths, KDR FROM war_kills ORDER BY kills DESC`

到

SELECT player, kills, deaths, kills / deaths as KDR FROM war_kills ORDER BY kills DESC`

Answer 2

按照建议修改SQL查询或在PHP循环中执行：

while($row = mysqli_fetch_array($result)) {
 echo "<tr>";
 echo "<td>" . $row['player'] . "</td>";
 echo "<td>" . $row['kills'] . "</td>";
 echo "<td>" . $row['deaths'] . "</td>";
 echo "<td>" . ($row['kills'] / $row['deaths']) . "</td>"; // <--- this one

 echo "</tr>";
}

Answer 3

您似乎需要根据玩家名称对结果进行分组。此外，您需要考虑何时deaths = 0。尝试将您的查询更改为 -

SELECT
    player, 
    SUM(kills) as kills, 
    SUM(deaths) as deaths, 
    CASE WHEN SUM(deaths) = 0 THEN SUM(kills)
         ELSE SUM(kills)/SUM(deaths)
    END as `KDR` 
FROM war_kills 
GROUP BY player
ORDER BY kills DESC

Answer 4

我读到的其他答案没有说明某人可能没有死亡的事实。如果他们这样做，你将得到除零误差。

在你的while循环中

，

if ($row['deaths'] == 0)
    $kdr = '-';
else
    $kdr = $row['kills']/$row['deaths'];

然后将$row['KDR']更改为$kdr

如何计算电脑游戏中的杀戮/死亡率？

4 个答案: