Question

我试图计算每个值出现在mysql数据库的一列中的次数，然后将其输出。

我的代码：

require("db_connection.php");

$sql = "SELECT name, q1_MC, q2, q3, q4, q5, q6, q7, q8_MC FROM commenttable";
$result = $conn->query($sql);

if ($result->num_rows > 0) {

while($row = $result->fetch_assoc()) {

echo "<tr><td>" . $row["name"]. "</td><td>" . $row["q1_MC"] . "</td><td>" . $row["q2"] . "</td><td>" . $row["q3"] . "</td><td>" . $row["q4"] . "</td><td>" . $row["q5"] . "</td><td>" . $row["q6"] . "</td><td>" . $row["q7"] . "</td><td>" . $row["q8_MC"] . "</td></tr>";



}

} else { 

    echo "0 results"; 

}


$conn->close();

所以q1_MC和q2_MC是我要计算其字段频率的列。他们从1-5取数字。

我一直在尝试将以下数组合并到我的代码中，但是我不知道如何。

$a=array("1","2","3","4","5");
print_r(array_count_values($a));

Answer 1

您可以使用sql来获得所需的SQL结果，您可以使用sql来区分和分组，例如q1_MC和q2_MC可以使用

SELECT name, count(distinct q1_MC)  freq1 ,  count(distinct q8_MC) freq8
FROM commenttable
GROUP BY name

Answer 2

最后到达那里。我使用array_count_values php函数，然后使用foreach函数遍历数组。

$q1_MC = array();
$q8_MC = array();

if ($result->num_rows > 0) {


    $counts = array('q1_MC' => array(0,0,0,0,0), 'q8_MC' => array(0,0,0,0,0));


    while($row = $result->fetch_assoc()) {


    array_push($q1_MC, $row['q1_MC']);
    array_push($q8_MC, $row['q8_MC']);


 echo "<tr><td>" . $row["name"]. "</td><td>" . $row["q1_MC"] . "</td><td>" 
. $row["q2"] . "</td><td>" . $row["q3"] . "</td><td>" . $row["q4"] . "</td> . 
 <td>" 
. $row["q5"] . "</td><td>" . $row["q6"] . "</td><td>" . $row["q7"] . "</td> 
.    <td>" 
. $row["q8_MC"] . "</td></tr>";

    }

} else { 

    echo "0 results"; 

}

$q1_answers = (array_count_values($q1_MC));
$q2_answers = (array_count_values($q8_MC));

echo "<div class='row mt-5 mb-5 mr-4 ml-4'>";
echo "<table class='table' id='questionsTable'><thead><tr><th>Question 1 
Multiple Choice answers</th></tr>";

foreach($q1_answers as $key => $item) {

echo "<tr><td>" . $key. "</td><td>" . $item. "</td></tr>";
}

echo "</tr></table></div>";


echo "<div class='row mt-5 mb-5 mr-4 ml-4'>";
echo "<table class='table' id='questionsTable'><thead><tr><th>Question 8 
Multiple Choice answers</th></tr>";

foreach($q2_answers as $key => $item) {

echo "<tr><td>" . $key. "</td><td>" . $item. "</td></tr>";
}

echo "</tr></table></div>";

计算每个值在列中出现的次数

2 个答案: