php: data from mysql changing from no data into zero : i have this table of "score" in my database

<!-- begin snippet: js hide: false console: true babel: false -->

<!-- language: lang-html -->

    !  id   !  A   ! 
    -----------------
    !  01   !  10  !  
    !  02   !      !  
    !  03   !      !  
    !  04   !  5   !  

<!-- end snippet -->


<!-- begin snippet: js hide: false console: true babel: false -->

<!-- language: lang-html -->

    $mySql = "SELECT score.id, score.A 
    				FROM score
    				ORDER BY score.id ASC"; 
    	$myQry = mysql_query($mySql, $koneksidb)  or die ("Query salah : ".mysql_error());
    	while ($myData = mysql_fetch_array($myQry)) {
    		$id=$myData['id'];
    		$A=$myData['A'];}

<!-- end snippet -->

when i call with

<!-- begin snippet: js hide: false console: true babel: false -->

<!-- language: lang-html -->

    <?php echo $A; ?>

<!-- end snippet -->

it came out with zero instead of no data, 

<!-- begin snippet: js hide: false console: true babel: false -->

<!-- language: lang-html -->

    !  id   !  A   ! 
    -----------------
    !  01   !  10  !  
    !  02   !  0   !  
    !  03   !  0   !  
    !  04   !  5   !

<!-- end snippet -->

what should i change?