SELECT 
    COALESCE(data.roundtime, 'N/A') AS StartTimestamp,
    COALESCE(CONCAT('H', TIMESTAMPDIFF(HOUR, DATE_FORMAT(data.roundtime, "%Y-%m-%d %H:00:00"), DATE_FORMAT(NOW(), "%Y-%m-%d %H:00:00"))), 'N/A') AS Hour,
    COALESCE(data.sScanner_Name, 'N/A') AS sScanner_Name,
    COALESCE(data.BadReads, 0) AS BadReads,
    COALESCE(data.CommFaults, 0) AS CommFaults,
    COALESCE(data.GoodReads, 0) AS GoodReads,
    COALESCE(data.MultiItems, 0) AS MultiItems,
    COALESCE(data.MultiReads, 0) AS MultiReads,
    COALESCE(data.NoData, 0) AS NoData,
    COALESCE(data.NoReads, 0) AS NoReads,
    COALESCE(data.BadReads, 0) + 
    COALESCE(data.CommFaults, 0) + 
    COALESCE(data.GoodReads, 0) + 
    COALESCE(data.MultiItems, 0) + 
    COALESCE(data.MultiReads, 0) + 
    COALESCE(data.NoData, 0) + 
    COALESCE(data.NoReads, 0) AS Total
FROM (SELECT 1) AS p
LEFT JOIN (
    SELECT 
        CONCAT(DATE(t_stamp), ' ', HOUR(t_stamp), ':00') AS roundtime,
        sScanner_Name,
        SUM(diScanner_bad_reads) AS BadReads,
        SUM(diScanner_comm_fault) AS CommFaults,
        SUM(diScanner_good_reads) AS GoodReads,
        SUM(diScanner_multi_items) AS MultiItems,
        SUM(diScanner_multi_reads) AS MultiReads,
        SUM(diScanner_no_data) AS NoData,
        SUM(diScanner_no_reads) AS NoReads
    FROM scanner_reads
    WHERE t_stamp BETWEEN :starttime AND :endtime
        AND (sScanner_Name = :scannername OR :scannername IS NULL OR :scannername = '')
    GROUP BY DATE(t_stamp), HOUR(t_stamp), sScanner_Name
) AS data ON 1=1
ORDER BY data.roundtime ASC;