Fill table accordingly with the table headers

I have one table named tb_dias that as 11 days inside. Each day as a id that identifies it.

I have other table called tb_disponibilidade, this table contains

id_nadador id_dia

Im getting all the 'dia' from tb_dias and making them as headers in my html table. My goal is to put all the id_nadador that are in each day, something similiar to this:

But what i am getting is this. My code isn't putting only the id_nadador that corresponds to each day, he is putting all the ids in the first day

My tables:

tb_disponibilidade

tb_dias

 <table class='tutorial-table'>
    <thead>
        <tr>
            <?php
                
            $sqlSelect = "SELECT * FROM tb_dias";
                $result = $db->select($sqlSelect);
                
                if (! empty($result)) {
                    foreach ($result as $row) { 
                        echo "<th>".$row['dia']."</th>";
                    }}
                ?>
        

        </tr>
    </thead>
    <?php
    $sqlSelect = "SELECT tb_disponibilidade.id_nadador,tb_dias.id_dia,tb_nadadores.nome 
    FROM ((tb_disponibilidade 
    INNER JOIN tb_dias ON tb_disponibilidade.id_dia = tb_dias.id_dia) 
    INNER JOIN tb_nadadores ON tb_disponibilidade.id_nadador = tb_nadadores.id_nadador);";
    $resultado = $db->select($sqlSelect);
    
foreach ($resultado as $res) {
    var_dump($res);
    
    // ($row = mysqli_fetch_array($result))
    ?>
    <tbody>
        <tr><?php 
      
       
             echo '<td>' .$res['id_nadador']. '</td>';
            
            ?>

        </tr>
        <?php
}
?>
    </tbody>
</table>
<?php

?>