What is the code for informing user that the data is updated or removed???

What data ? Please explain with an example.

After a user submitted a form and a message will be shown

Depends on the code you have. You can output anything you want. Describe what happens, or show code.

$query = mysql_query("DELETE from table WHERE id = '25' ");
if($query)
{
echo 'Deleted Successfully';
}
else
{
echo 'Deletion Failed';
}

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