ddd

-

 SELECT 

    t1.car_no,

    SUM(DATEDIFF(FROM_UNIXTIME(t1.allocation_to_date), FROM_UNIXTIME(t1.allocation_from_date)) + 1) AS total_days_booked,

    SUM(

        CASE

            WHEN t2.allocation_to_date IS NOT NULL THEN 

                DATEDIFF(FROM_UNIXTIME(t1.allocation_from_date), FROM_UNIXTIME(t2.allocation_to_date)) - 1

            ELSE 

                0

        END

    ) AS missing_days

FROM 

    tbl_booked_car_details t1

LEFT JOIN 

    tbl_booked_car_details t2 ON t1.car_no = t2.car_no AND FROM_UNIXTIME(t1.allocation_from_date) > FROM_UNIXTIME(t2.allocation_to_date)

GROUP BY 

    t1.car_no;


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