SELECT 
    CONCAT(DATE(t_stamp), ' ', HOUR(t_stamp), ':00') AS StartTimestamp,

    CONCAT(
        'H',
        TIMESTAMPDIFF(
            HOUR,
            DATE_FORMAT(t_stamp, "%Y-%m-%d %H:00:00"),
            DATE_FORMAT(NOW(), "%Y-%m-%d %H:00:00")
        )
    ) AS Hour,

    'S03' AS sInduction_Name,

    COUNT(*) AS Total_count

FROM item_data
WHERE t_stamp BETWEEN :starttime AND :endtime
    AND adiSort_Code_0 NOT IN (11, 15)
    AND sLocation_ID LIKE 'S03%'
    AND (:inductionname IS NULL OR :inductionname = '' OR :inductionname = 'S03')

GROUP BY DATE(t_stamp), HOUR(t_stamp)
ORDER BY StartTimestamp ASC;