Validation error in submitting the form

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PHP

While submitting the form if empty name means error message to show. I using one html page and one php page . What i am getting is eventhough the name is not in also it will storing in other data given like age into database. I need the answer as [* Username missing ] on the side of textfield and not going to next form. KIndly help pls

What I have tried:

<?php

$link = mysqli_connect("localhost", "root", "", "training");

if(isset($_POST['submit']))
{

$fname = $_POST['fname'];

if (empty($_POST["name"])) {
$fnameErr = "Missing";
}
else {
$fname = ($_POST["fname"]);
}
$sql = "INSERT INTO record (Name) VALUES ('$fname')";

$op = mysqli_query($link,$sql);
if($op){
echo "Student info inserted";
}
else{
echo "not inserted";
}

}
mysqli_close($link);
?>