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QuestionHow to print for each primary key all the foreign keys column related to it? Pin
EliotSimpleMan5-May-21 14:40
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I want to solve a PHP issue

I have a db with 2 tables: first one is "document":

           id  |    title       |                                   
      ================================
           1   |    equations    | 
           2   |    great        |  
           3   |    painting     |
second one is "pic":

          id   |   doc_id        |   description
    ===============================================
           1   |    1            |  "mathematics"
           2   |    1            |  "physic"
           3   |    2            |  "litterature"
           4   |    2            |  "art"
     
the "doc_id" is a foreign key, related to the id of the table "document"
this is my question: I'm trying to print for each title, all the descriptions related to it, example:

  for the title "equations" , the foreign key related to it, is "doc_id =1"
  wich means for "equations" i will  print "matematics" and "physic" 
the final table printed using PHP and SQL, on my browser, should be:

             |   tiltle      |   description
    ===============================================
             | equations     |  mathematics, physic
             | great         |   litterature , art 
             | painting      |  
        
Here's my code:


PHP
<pre><?php
$servername = "localhost";
$username = "root";
$password = "root";
$dbname = "doc-pic";
// Create connection
$conn =  mysqli_connect($servername, $username, $password, $dbname);
// Check connection
$sql = "SELECT * FROM pic LEFT JOIN document ON pic.doc_id=document.id";
                   $result = mysqli_query($conn, $sql);
$sql1 = "SELECT title from document";
                  $result1 = mysqli_query($conn, $sql1);
?>
           <table>    
           <?php
 if (mysqli_num_rows($result1) > 0)
            while($row = mysqli_fetch_array($result1)){?>
            <tr>
            <td><?php echo $row["title"]; ?></td>
            </tr>
            <?php  if (mysqli_num_rows($result) > 0 )
                     while($row = mysqli_fetch_array($result)){
                     ?>
                     <tr>
                     <td><?php echo $row["doc_id"]; ?></td>
                     <td><?php echo $row["description"]; ?></td>
                     </td>
                     </tr>
                     </td>
           <?php }

 } ?>


thanks in advance
AnswerRe: How to print for each primary key all the foreign keys column related to it? Pin
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