php - mysql_num_rows returns 1 -


why code below returns 1 although there no elements in field group_members ? 

$conn = mysql_connect($host,$user,$pass);  @mysql_select_db($db);  $sql = "     select          group_members             tbl_group             group_id = '6'       ";  $res = mysql_query($sql);  $rows = mysql_num_rows($res);  echo $rows;

?>

the sql wrote select rows group_id = 6 , return value of field group_members regardless content. want, try:

select group_members tbl_group group_id = 6 , group_members <> '' // depending on type might <> null or <> 0

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