MySQL查詢輸出我怎麼能在我的查詢輸出中爲「合格」或「不合格」創建第三個列子查詢

Question

之間作儀，當比分等於maxScore

<?php 

$database =& JFactory::getDBO(); 

//Declare Variables 
$user = JFactory::getUser(); 
$id = $user->get('id'); 
$name = $user->get('name'); 

// Display quizzes 
echo "</br>"; 
echo "<h1>"; 
echo "Quizzes History for : " ; 
echo "<b>"; 
echo $name; 
echo "</h1>"; 
echo "</b>"; 


echo "</br>"; 
echo "</br>"; 

$database->setQuery(" SELECT distinct qui.title AS Course_Name, 

(SELECT sum(score) 
FROM jos_jquarks_quizzes_answersessions  

    WHERE score IS NOT NULL AND quizsession_id = quizSession.id  
    AND status <> -1) AS score, 

(SELECT count(distinct question_id) FROM jos_jquarks_quizzes_answersessions    
WHERE quizsession_id = quizSession.id) AS maxScore, 


DATE_FORMAT(quizSession.finished_on,'%W, %M %e, %Y @ %h:%i %p') As Finished FROM jos_jquarks_quizsession AS quizSession 

LEFT JOIN jos_jquarks_users_quizzes AS users_quizzes ON users_quizzes.id = quizSession.affected_id  
LEFT JOIN jos_jquarks_quizzes AS qui ON users_quizzes.quiz_id = qui.id  
LEFT JOIN jos_jquarks_quizzes_answersessions AS quizSessAns ON quizSessAns.quizsession_id = quizSession.id 
LEFT JOIN jos_jquarks_sessionwho AS sessionWho ON sessionWho.session_id = quizSession.id   
LEFT JOIN jos_jquarks_users_profiles AS users_profiles ON users_profiles.user_id = sessionWho.user_id 
LEFT JOIN jos_jquarks_profiles AS profiles ON profiles.id = users_profiles.profile_id 
WHERE sessionWho.user_id = " .$id ) ; 

if (!$database->query()) { //write data and if error occurs alert 
    echo "<script> alert('".$database->getErrorMsg()."'); </script>"; 
} 
$tableStyle = "padding: 5px;border:1px solid black"; 
$tdStyle = "padding:5px"; 
$thStyle = "padding:7px"; 

$row = $database->loadRowList(); 
if (0<count($row)) { 
    echo '<table style="', $tableStyle, '" cellpadding="7" cellspacing="7">'; // with echo, commas are slightly more effective than dots 
    echo '<tr><th style="', $thStyle, '" align=center>Quiz Title </th><th style="', $thStyle, '" align=center> Score </th> 
    <th style="', $thStyle, '" align=center>Maximum Score </th> 
<th style="', $thStyle, '" align=center>Finished On </th></tr>'; 

    $row = $database->loadRowList(); 
    foreach($row as $valuearray) { 
     echo '<tr align="center">'; 

     foreach($valuearray as $field){ 
      echo '<td style="', $tdStyle, '" align=center>', $field, '</td>'; // note: there was an error here 
     } // field 
     echo '</tr>'; // note: apostrophs rather than " every time it is possible 
    } // $valuearray 
    echo '</table>'; 
} // if count 
?> 

Answer 1

使用變量：

SELECT DISTINCT qui.title AS Course_Name, 

    @score := (SELECT sum(score) FROM jos_jquarks_quizzes_answersessions  
    WHERE score IS NOT NULL AND quizsession_id = quizSession.id  
    AND status <> -1) AS score, 

    @maxScore := (SELECT count(distinct question_id) 
    FROM jos_jquarks_quizzes_answersessions    
    WHERE quizsession_id = quizSession.id) AS maxScore, 

    IF(@score = @maxScore, 'Pass', 'Fail') AS passOrFail 

    ... 

但我個人會在我的PHP應用程序中做這個測試。

Answer 2

SELECT 
    x.CourseName, 
    x.score, 
    x.maxScore, 
    x.Finished, 
    CASE 
     WHEN x.score = x.maxScore THEN 'Pass' 
     ELSE 'Fail' 
    END AS PassFail 
FROM (
    SELECT 
     distinct qui.title AS Course_Name, 
     ( SELECT sum(score) 
      FROM jos_jquarks_quizzes_answersessions  
      WHERE score IS NOT NULL AND quizsession_id = quizSession.id AND status <> -1 
     ) AS score, 
     ( SELECT count(distinct question_id) 
      FROM jos_jquarks_quizzes_answersessions 
      WHERE quizsession_id = quizSession.id 
     ) AS maxScore, 
     DATE_FORMAT(quizSession.finished_on,'%W, %M %e, %Y @ %h:%i %p') As Finished 
    FROM jos_jquarks_quizsession AS quizSession 
    LEFT JOIN jos_jquarks_users_quizzes AS users_quizzes ON users_quizzes.id = quizSession.affected_id  
    LEFT JOIN jos_jquarks_quizzes AS qui ON users_quizzes.quiz_id = qui.id  
    LEFT JOIN jos_jquarks_quizzes_answersessions AS quizSessAns ON quizSessAns.quizsession_id = quizSession.id 
    LEFT JOIN jos_jquarks_sessionwho AS sessionWho ON sessionWho.session_id = quizSession.id   
    LEFT JOIN jos_jquarks_users_profiles AS users_profiles ON users_profiles.user_id = sessionWho.user_id 
    LEFT JOIN jos_jquarks_profiles AS profiles ON profiles.id = users_profiles.profile_id 
    WHERE sessionWho.user_id = " . $id . " 
    ) x