Select 语句条件 WHERE 子句 - 如何在同一查询中添加不受 WHERE 子句影响的变量

Question

我有这个 SQL 查询：如果可能的话，我需要某种条件 WHERE 子句，以便在除此行下方 -> $row ['value_count_deaths'] 之外的所有内容上使用 WHERE 子句。

我不希望这个被过滤并在被过滤之前显示整数。 这可能在同一个查询中吗？ 如果是这样……怎么办？

IMG：我想在他们的名字后面累积死亡数字，必须在WHERE子句之外

代码重点：

echo "<td style='text-align: center'>" . $row['pe_DataPlayers_lastname'] . " " . $row['value_count_deaths'] . "</td>";

所有整体编码查询语句：

    echo "<h3> All Pilot Statistics (Realistic/Hardcore) ... only populate stats after last pilot death for each pilot</h3>";
    if ($result = $mysqli->query("SELECT a.`pe_LogEvent_pilotname`, 
    COUNT(a.`pe_LogEvent_deaths`) AS value_count_deaths,
    COUNT(a.`pe_LogEvent_kills_planes`) AS value_count_kills_planes,
    COUNT(a.`pe_LogEvent_kills_helicopters`) AS value_count_kills_helicopters,
    COUNT(a.`pe_LogEvent_kills_armor`) AS value_count_kills_armor,
    
    b.`pe_DataPlayers_lastname`, 
    b.`pe_DataPlayers_updated`,
    b.`pe_DataPlayers_id`,
    c.`pe_LastPilotDeath_pilotname`,
    c.`pe_LastPilotDeath_datetime` 
    FROM `pe_LogEvent` AS a 
    INNER JOIN `pe_DataPlayers` AS b 
    ON a.pe_LogEvent_pilotname = b.pe_DataPlayers_lastname 
    LEFT JOIN `pe_LastPilotDeath` AS c 
    ON b.pe_DataPlayers_lastname=c.pe_LastPilotDeath_pilotname 
    WHERE a.`pe_LogEvent_datetime` > c.`pe_LastPilotDeath_datetime`
    GROUP BY b.`pe_DataPlayers_lastname` 
    ORDER BY b.`pe_DataPlayers_updated` DESC")) {
    
        echo "<table>";
        echo "<table class='table_stats'>";
        echo "<tr class='table_header'><th>Pilot</th><th>Last Flight Log</th><th>A2A Kills</th><th>A2G Kills</th><th>Sorties</th><th>Landing%</th><th>Deaths</th><th>Ejections</th><th>Crashes</th><th>PVP Kills</th><th>Team Kills</th><th>Planes</th><th>Helos</th><th>Armor</th><th>Light Vehicles</th><th>UnArmored</th><th>Air Defense</th><th>Artillery</th><th>Infantry</th><th>Ships</th><th>Structures</th></tr>"; // First Code                   
        while($row = mysqli_fetch_array($result))
        {
            echo "<tr>";
                echo "<td style='text-align: center'>" . $row['pe_DataPlayers_lastname'] . " " . $row['value_count_deaths'] . "</td>";      
                echo "<td style='text-align: center'>" .    
$row['value_count_deaths'] . "</td>";
                echo "<td style='text-align: center'>" . $row['value_count_ejections'] . "</td>";                           
                echo "<td style='text-align: center'>" . $row['value_count_crashes'] . "</td>";     
                //echo "<td style='text-align: center'>" . $row['value_sum_pvp'] . "</td>";
 

            echo "</tr>";
        }
        echo "</table>";
        
        $result->close();
    }

Answer 1

一种典型的方法是使用子查询来创建标志。

您的代码看起来像 MySQL，所以它使用 MySQL 语法约定：

SELECT SELECT pe_LogEvent_pilotname, pe_LogEvent_friendly_fire_killer,
       COUNT(*) as total,
       SUM(pe_LogEvent_crashes IS NOT NULL AND flag) AS value_count_crashes,
       . . .
FROM (SELECT le.*,
             . . . ,   -- other columns you want
             (le.pe_LogEvent_datetime > lpd.pe_LastPilotDeath_datetime) as flag
      FROM pe_LogEvent le JOIN
           pe_DataPlayers dp
           ON le.pe_LogEvent_pilotname = dp.pe_DataPlayers_lastname LEFT JOIN
           pe_LastPilotDeath lpd
          ON dp.pe_DataPlayers_lastname = lpd.pe_LastPilotDeath_pilotname 
     ) x
GROUP BY . . .