Disabled checkbox if the value is in database

Hello guys can help me? about how I disabled a checkbox if the value of checkbox is already in database I have inserted value of 1A,1B in database, but suddenly all the checkbox is disabled :( here's my simple code

 <?php
    //Connections
$server_name='localhost';
$username='root';
$password='admin';
$db_name='matnogreservationv2';
$con= mysqli_connect($server_name, $username, $password, $db_name);
if(mysqli_connect_errno())
{
    echo 'Failed..!!'.mysqli_connect_errno();
} 
>?


//code for disabling checkbox
$resulta= mysqli_query($con,"SELECT * FROM seat WHERE SeatStatus = 1");
$display = mysqli_num_rows($resulta);
$con->query($display);
$disable = $display ? 'disabled="disabled"': '';

<input type="checkbox" name="seat[]" id="1A" value="1A"  <?php echo $disable; ?>>
          <label for="1A">1A</label>

          <input type="checkbox" name="seat[]" id="1B" value="1B" <?php echo $disable; ?>>
          <label for="1B">1B</label>

          <input type="checkbox" name="seat[]" id="1C" value="1C"<?php echo $disable; ?>>
          <label for="1C">1C</label>

          <input type="checkbox" name="seat[]"  id="1D" value="1D"<?php echo $disable; ?>>
          <label for="1D">ID</label>

          <input type="checkbox" name="seat[]" id="1E" value="1E"<?php echo $disable; ?>>
          <label for="1E">1E</label>

          <input type="checkbox" name="seat[]" id="1F" value="1F"<?php echo $disable; ?>>
          <label for="1F">1F</label>

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