Could i merge this two select query in one?

Question

My aim is to show/display in the right part questions of the survey (from a table of my database) and in the left part answers from customers (from another table in my database) in the right part. So my question is : How to merge this two select query ? I did some research but with php it's kind of tricky to understand and I'm still new on php too. Any help or advices are welcome .

Best Regards AV

<?php
    include("bdconnect_Foredeck.php");
    $link=mysqli_connect($host,$login,$pass,$dbname);

    if(isset($_POST["bouton55"])){
        $link = mysqli_connect($host,$login,$pass,$dbname);  

        $id = $_REQUEST["Zoubi"];
        $ClientRef =$_REQUEST["KGB"];

        $rechercheq = "SELECT Qref,Ref,Question FROM questionnaire WHERE Qref ='$id' ";
        $recherche= "SELECT choix,commentaire FROM reponse WHERE RefQ ='$id' and ref_Client ='$ClientRef'";

        mysqli_query($link,$recherche);
        mysqli_query($link,$rechercheq);

        $result1=mysqli_query($link,$rechercheq); 
        $result= mysqli_query($link,$recherche);

        while($row = mysqli_fetch_assoc($result,$result1)){
            $Ref =$row["Ref"];
            $Question       =$row["Question"];
            $Choix =$row["choix"];
            $Commentara =$row["commentaire"];

            echo" <tr bgcolor=\"white\">
            <td>  $id  </td>
            <td> $Ref </td>
            <td>$Question </td>
            <td>$Choix       </td>
            <td>$Commentara         </td>
            </tr>";
        }
    }
?>

Answer 1

You could use a JOIN

    SELECT a.Qref, a.Ref,a.Question , b.choix, b.commentaire
    FROM questionnaire as a 
    LEFT JOIN reponse as b ON  a.RefQ = b.RefQ
    WHERE a.Qref ='$id' 
    AND b.ref_Client ='$ClientRef'

if you have duplicated rows .. then you can use distinct

    SELECT DISTINCT a.Qref, a.Ref,a.Question , b.choix, b.commentaire
    FROM questionnaire as a 
    LEFT JOIN reponse as b ON  a.RefQ = b.RefQ
    WHERE a.Qref ='$id' 
    AND b.ref_Client ='$ClientRef'

otherwise you logic don't permit a single query