mysql书写格式的区别（15分）,该如何解决

mysql书写格式的区别（15分）
$sql   =   "insert   into   users(   username,password,sex,mail,tel,web,birthday,inter,intro,reg_time)   ";

$sql   .=   "   values( '{$name} ', '{$pass} ', '{$sex} ', '{$mail} ', '{$tel} ', '{$web} ', '{$birthday} ', '{$inter} ', '{$intro} ', '{$reg_time} ') ";


$sql   =   "insert   into   users(   username,password,sex,mail,tel,web,birthday,inter,intro,reg_time)   ";

$sql   .=   "   values( '{$name} ', ";
$sql   .=   "   '{$pass} ', ";
$sql   .=   "   '{$sex} ', ";
$sql   .=   "   '{$mail} ',   ";
$sql   .=   "   '{$tel} ',   ";
$sql   .=   "   '{$web} ',   ";
$sql   .=   "   '{$birthday} ',   ";
$sql   .=   "   '{$inter} ',   ";
$sql   .=   "   '{$intro} ',   ";
$sql   .=   "   '{$reg_time} ')   ";

上边两种格式的区别是什么啊？

------解决方案--------------------
没区别