SQL Query to Select a Row By an ID Number "Out Of" a Column?

[glassfish]

The Script:

<?php

    include("connect.php");

?>
<?php

    echo "<h1>The Hashtag: </h1>";
    if(isset($_GET['hashtag'])){
        echo $_GET['hashtag'];
    }


    // Select the ID of the given hashtag from the "hashtags" table.
    $tqs = "SELECT `id` FROM `hashtags` WHERE `hashtag` = '" . $_GET['hashtag'] . "'";
    $tqr = mysqli_query($dbc, $tqs) or die(mysqli_error($dbc));
    $row = mysqli_fetch_assoc($tqr);

    // This prints e.g.:
    // 100
    echo "<br/><br/>";
    print_r($row['id']);

    // Select the threads from the "thread" table which contains the hashtag ID number.
    $tqs_two = "SELECT * FROM `thread` WHERE `hashtag_id` IN ('" . $row['id'] . "')";
    $tqr_two = mysqli_query($dbc, $tqs_two) or die(mysqli_error($dbc));
    $row_two = mysqli_fetch_assoc($tqr_two);

    echo "<br/><br/>";
    print_r($row_two);

?>

The script should select the rows by that ID number of the hashtag. It should look in the "hashtag_id" column of the table and see if that ID number can be found there, if it can be found there, then it should select that row.

 

The ID numbers are inside that "hashtag_id" column separated by commas.

 

Example:

98, 99, 100

My Question:

How to do the SQL query so it selects the rows by the hashtag ID number?

[Barand]

It was precisely to avoid this problem when I advised you to normalize you data correctly here

http://forums.phpfreaks.com/topic/291641-store-the-id-number-inside-one-array-inside-for-loop/?do=findComment&comment=1493641