php - 在 php/mysqli 中隐藏重复的行？

Question

我希望你做得好，我在学校项目中工作，管理其中的所有影响，我遇到了图像描述的问题 duplicate each row我的目的是只显示一个“MATIERE”和所有“NOTE_DEVOIR”(表格中的 devoir)，但我得到的每个 matiere 都与我们在这个中的“devoir”一样多。

注意:老师在他们的“MODULE_DEVOIR”中加上“NOTE_DEVOIR”，这意味着“MODULE”每次都是重复的，其中有“NOTE_DEVOIR” database

我需要隐藏而不是删除

PHP:

echo"<br><button class='btn btn-info cursor' name='butAf'>Afficher</button>";



if(isset($_POST['butAf']))
{        

    /*ID_CLASS and ID_ANNEE just to filter the class and the year of study*/
$query5 = "select * from devoir inner join prof_an_cls on  prof_an_cls.ID_PROF_AN_CLS = devoir.ID_PROF_AN_CLS where CIN_ELEVE = '$cinE' and ID_ANNEE=$ID_ANNEE and  ID_CLASS = $ID_CLASS";
$result5 = mysqli_query($con,$query5);
if(mysqli_num_rows($result5)>0)
{
    echo"<table class='table table-bordered table-striped table-hover table-info'><tr>
    <th>MATIERE</th>
    <th>devoir1</th>
    <th>devoir2</th>
    <th>devoir3</th>
    <th>devoir4</th>
    <th>devoir5</th>

    </tr>
    ";
    while($rows = mysqli_fetch_assoc($result5))
    {/*i guess this loop its the reason of duplicating */
       $moduleD = $rows['MODULE_DEVOIR'];

    $queryDEV = "select * from devoir inner join eleve on devoir.CIN_ELEVE = eleve.CIN_ELEVE where eleve.CIN_ELEVE = '$cinE' and MODULE_DEVOIR = '$moduleD' order by MODULE_DEVOIR";

    $resultDEV = mysqli_query($con,$queryDEV);
        echo"<tr><td>$moduleD</td>";     

           while($rows = mysqli_fetch_assoc($resultDEV))/*loop2*/
            {
                $noteDEV = $rows['NOTE_DEVOIR'];

                  echo"<td>$noteDEV</td>";


              }


        echo"</tr>";
    }



    echo"</table>";
}
}

Answer 1

你要么使用

DISTINCT

SELECT DISTINCT column . . . WHERE . . .

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分组依据

SELECT column . . . WHERE . . . GROUP BY column

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您可以在这个 answer 中查看差异