我在下面有一个“答案”数据库表：
答案表
AnswerId SessionId QuestionId Answer
13 AAA 1 A
14 AAC 1 True
现在您可以看到，考试（会议）AAA 中的问题 1 有 1 个答案，而这些是考试（会议）AAC 中问题 1 的 1 个答案。
下面是“问题”表：
问题表：
SessionId QuestionId QuestionContent NoofAnswers ReplyId QuestionMarks OptionId
AAA 1 What is 2+2? 1 1 5 2
AAC 1 Is 3+3 = 6? 1 1 5 25
现在我有一个搜索功能，用户可以从问题中输入一个术语并编译搜索。因此，例如，如果用户输入“2+2”，则结果应显示在 php/html 表中：
QuestionContent Option Type Number of Answers Answer Number of Replies Number of Marks
What is 2+2? A-D 1 A Single 5
但问题是它显示了一个额外的行，它在下面显示：
QuestionContent Option Type Number of Answers Answer Number of Replies Number of Marks
What is 2+2? A-D 1 A True Single 5
What is 2+2? A-D 1 A True Single 5
现在我的问题是，为什么它显示两行，为什么它在“答案”列下包含答案“真”，而该问题的答案应该只是“A”？我相信这是因为这两个问题具有相同的 QuestionId（问题编号），但它们都属于不同的 SessionId，所以这应该不是问题。
下面是执行查询并输出结果的代码（我已将其简化，以便您更容易阅读并希望看到问题）：
<?php
//connect to db
// Build the query
$questionquery = "
SELECT DISTINCT q.QuestionContent, o.OptionType, q.NoofAnswers, GROUP_CONCAT(DISTINCT Answer SEPARATOR '') AS Answer, r.ReplyType,
q.QuestionMarks
FROM Answer an
INNER JOIN Question q ON q.QuestionId = an.QuestionId
JOIN Reply r ON q.ReplyId = r.ReplyId
JOIN Option_Table o ON q.OptionId = o.OptionId
WHERE ".implode(" AND ", array_fill(0, $numTerms, "q.QuestionContent LIKE ?"))."
GROUP BY an.SessionId, an.QuestionId
ORDER BY ".implode(", ", array_fill(0, $numTerms, "IF(q.QuestionContent LIKE ?, 1, 0) DESC"))."
";
// Make the referenced array
$referencedArray = make_values_referenced(array_merge(
array(str_repeat("ss", $numTerms)), // types
$termArray, // where
$termArray // order by
));
// Bind parameters
if (!call_user_func_array(array($stmt, 'bind_param'), make_values_referenced($referencedArray))) {
die("Error binding parameters: $stmt->error");
}
// This will hold the search results
$searchResults = array();
$searchOption = array();
$searchNoofAnswers = array();
$searchAnswer = array();
$searchReply = array();
$searchMarks = array();
// Fetch the results into an array
if (!$stmt->num_rows()) {
$stmt->bind_result($dbQuestionContent,$dbOptionType,$dbNoofAnswers,$dbAnswer,$dbReplyType,$dbQuestionMarks);
while ($stmt->fetch()) {
$searchResults[] = $dbQuestionContent;
$searchOption[] = $dbOptionType;
$searchNoofAnswers[] = $dbNoofAnswers;
$searchAnswer[] = $dbAnswer;
$searchReply[] = $dbReplyType;
$searchMarks[] = $dbQuestionMarks;
}
}
}
$questionnum = sizeof($searchResults);
// If $searchResults is not empty we got results
if (!empty($searchResults)) {
echo "<p>Your Search: '$inputValue'</p>";
echo"<p>Number of Questions Shown from the Search: <strong>$questionnum</strong></p>";
echo "<table border='1' id='resulttbl'>
<tr>
<th class='questionth'>Question</th>
<th class='optiontypeth'>Option Type</th>
<th class='noofanswersth'>Number of <br/> Answers</th>
<th class='answerth'>Answer</th>
<th class='noofrepliesth'>Number of <br/> Replies</th>
<th class='noofmarksth'>Number of <br/> Marks</th>
</tr>\n";
$script = '';
foreach ($searchResults as $key=>$question) {
$script .= 'var key_' . $key . '="' . str_replace('"','\"', $question) . '";' . PHP_EOL;
echo '<tr class="questiontd">'.PHP_EOL;
echo '<td>'.htmlspecialchars($question).'</td>' . PHP_EOL;
echo '<td class="optiontypetd">'.htmlspecialchars($searchOption[$key]).'</td>' . PHP_EOL;
echo '<td class="noofanswerstd">'.htmlspecialchars($searchNoofAnswers[$key]).'</td>' . PHP_EOL;
echo '<td class="answertd">'.htmlspecialchars(implode(' ', $searchAnswer)).'</td>' . PHP_EOL;
echo '<td class="noofrepliestd">'.htmlspecialchars($searchReply[$key]).'</td>' . PHP_EOL;
echo '<td class="noofmarkstd">'.htmlspecialchars($searchMarks[$key]).'</td>' . PHP_EOL;
echo "<td class='addtd'><button type='button' class='add' onclick=\"parent.addwindow(key_$key,'$searchMarks[$key]','$searchNoofAnswers[$key]','$searchOption[$key]','$searchReply[$key]','$searchAnswer[$key]');\">Add</button></td></tr>";
}
echo "</table>" . PHP_EOL;
echo '<script type="text/javascript">' . PHP_EOL;
echo $script;
echo '</script>' . PHP_EOL;
}
?>