setInterval(function() {
var currentRowsCount = $('#tableId tr').length - 1; // or ID or Date
var table = $('#tableId');
$.ajax({
type: "POST",
url: "some.php",
data: { rows: currentRowsCount },
dataType: "json"
}).done(function( response ) {
var data = $.parseJSON(response);
$(data).each(function(key, value) {
// add the new rows using any of the append, prepend, before or after methods
})
});
}, 60000); // 1 min