สอบถาม chart.js การสร้างกราฟโดย แสดงชื่อที่ไม่ซ้ำกันครับ

<?php 

    header('Content-Type: application/json');

    include_once('config.php');

    $data = array();
    $query = "SELECT 
    account.m_fullname as 'by', 
    dairy_list.dairy_list_name as 'job', 
    dairy_calendar.dairy_date as 'date', 
    dairy_calendar.dairy_timestamp as 'timestamp', 
    COUNT(dairy_calendar.dairy_list_id) as count_job
    FROM dairy_calendar
    LEFT JOIN account ON account.m_id = dairy_calendar.dairy_stamp_by
    INNER JOIN dairy_category ON dairy_category.dairy_c_id = dairy_calendar.dairy_c_id 
    INNER JOIN dairy_list ON dairy_list.dairy_list_id = dairy_calendar.dairy_list_id
    GROUP BY account.m_fullname,dairy_calendar.dairy_list_id
    ORDER BY account.m_fullname
    ";
    $statement = $db->prepare($query);
    $statement->execute();
    $result = $statement->fetchAll(PDO::FETCH_ASSOC);

    foreach($result as $row)
    {
        $data[] = $row;
    }

    // var_dump($data);
    echo json_encode($data, JSON_UNESCAPED_UNICODE);


?>

 $(document).ready(function() {
            
            $.ajax({
                url:"fetch.php",
                type:"GET",
                success:function(data) {
                    console.log(data);
                    var job = [];
                    var name = [];
                    var datejob = [];
                    var countjob = [];
                    for(var i in data) {
                        name.push("" + data[i].by);
                        job.push(data[i].job);
                        datejob.push(data[i].date);
                        countjob.push(data[i].count_job);
                    }

                    var chartdata = {
                        labels: name,
                        datasets: 
                        [
                            {
                                label: 'JOB DAIRY',
                                fill: false,
                                backgroundColor: chartColors.green,
                                borderColor: chartColors.green,
                                hoverBackgroundColor: chartColors.green,
                                hoverBorderColor: chartColors.green,
                                data: countjob,
                            },
                        ]
                    };

                    var ctx = $('#graphCanvas');
                    var barGraph = new Chart(ctx, {
                        type: 'bar',
                        data: chartdata
                        
                    })
                },
                error:function(data) {
                    console.log(data);
                }
            })
        });
        window.chartColors = {
            red: 'rgb(255, 99, 132)',
            orange: 'rgb(255, 159, 64)',
            yellow: 'rgb(255, 205, 86)',
            green: 'rgb(75, 192, 192)',
            blue: 'rgb(54, 162, 235)',
            purple: 'rgb(153, 102, 255)',
            gold: 'rgb(248,193,28)',
            grey: 'rgb(201, 203, 207)'
        };