如何在while循环中从mysqli\u fetch\u array()中检索当前和下一个元素？

plupiseo 于 2021-06-20 发布在 Mysql

关注(0)|答案(2)|浏览(241)

我有一个表，可以有多个相同的记录。所以我想做一些任务，如果有多个记录是相同的。在这种情况下我怎么能检查呢。

<div>
<table class="table">

<thead class="table table-bordered" style="background-color:#EBF5FB;">
  <tr>
    <th>Name</th>
    <th>Locations</th>
    <th>Type</th>
    <th>Number</th>
    <th>Users</th>
    <th>Edited</th>
    <th>ID</th>
  </tr>
</thead>

<div class="pre-scrollable">
<tbody id="myTable">

 <?php
        include_once 'Connection.php';
        $check_test=mysqli_query($GLOBALS['db'],"select * from test ORDER bY id DESC");

        while ($row = mysqli_fetch_array($check_test)) {
            echo '<td>'.$row['name'].'</td>';
            echo '<td>'.$row['region'].'</td>';
            echo '<td>'.$row['number'].'</td>';
            echo '<td>'.$row['rollno'].'</td>';
            echo '<td>'.$row['created'].'</td>';
            echo '<td></td>';
            echo '</tr>';
        }   
    ?>
</tbody>
</div>

</table>
</div><br/>

表行示例：

'genarate id', 'us-west-4', 'Test', '1', '15', '2018-06-06 23:43:02','93'

'genarate id', 'us-east-3', 'Test', '1', '15', '2018-06-06 23:43:02', '93'

如果行是这样的，我需要像这样打印一次记录

'genarate id', 'us-east-3 , us-west-4', 'Test', '1', '15', '2018-06-06 23:43:02',  '93'

mysql php Html

来源：https://stackoverflow.com/questions/50735569/how-to-retrieve-the-current-and-next-element-from-mysqli-fetch-array-in-while

2条答案

按热度按时间

mlnl4t2r1#

不是在php中，而是在sql中，您可以更改查询以执行以下操作：

SELECT name, email, address, rollno, count(*) as nb
FROM test
GROUP BY name, email, address, rollno
ORDER BY id DESC

然后在php中，只需显示数字：

while ($row = mysqli_fetch_array($check_test)) {
            echo $row['name'];
            echo $row['email'];
            echo $row['address'];
            echo $row['rollno'];
            echo $row['nb'];
 }

由于您的评论，您正在寻找的是组\u concat，以下是查询：

SELECT GROUP_CONCAT(name) as names, email, address, rollno
FROM test
GROUP BY email, address, rollno
ORDER BY id DESC

因为你没有写你想要连接的字段，我选择了name，但是如果你也改变了组，你可以为任何一列写。要了解有关函数组concat的更多信息，请参阅手册：group concat

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h6my8fg22#

You can get the distinct records by using SELECT DISTINCT statement.

<?php
    include_once 'Connection.php';
    $check_test=mysqli_query($GLOBALS['db'],"select DISTINCT name, email, address, rollno from test ORDER bY id DESC");

    while ($row = mysqli_fetch_array($check_test)) {
        echo $row['name'];
        echo $row['email'];
        echo $row['address'];
        echo $row['rollno'];
    }   
?>

或者，如果您想知道哪些记录是重复的，那么-您可以使用此sql查询

SELECT 
  first_name, COUNT(first_name),
  last_name,  COUNT(last_name),
  email,      COUNT(email)
FROM
  contacts
GROUP BY 
  first_name , 
  last_name , 
  email
HAVING  COUNT(first_name) > 1
AND COUNT(last_name) > 1
AND COUNT(email) > 1;

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如何在while循环中从mysqli\u fetch\u array()中检索当前和下一个元素？

2条答案

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