Refresh specific HTML content that retrieves data from MySQL

PHP Snippet 1:

    $(document).ready(function(){
        $('#btn_submit').click(function(){
            var get_data = $('#new_base').val();
            
            if($.trim(get_data) != '')
                {
                    $.ajax({
                        url:"db2.php",
                        method:"POST",
                        data:{new_base:get_data},
                        dataType:"text",
                        success:function(data)
                        {
                            $('#new_base').val("");
                        }   
                    });     
                }   
        });         
        setInterval(function(){
            $('#load_data').load("fetch.php").fadeIn("slow")
        }, 1000);
    });