Question

SELECT

    rates_Calendar.date,
    subQuery.name,
    COALESCE(subQuery.amount,0) as amount,
    subQuery.reference,
    subQuery.property


FROM
    rates_Calendar
    LEFT JOIN (
                SELECT
                    rates_Booking.date,
                    unit.unit,
                    unit.abbreviation as name,
                    rates_Booking.amount,
                    rates_Booking.bookingReference AS reference,
                    property.property


                FROM
                    rates_Booking

                    LEFT JOIN booking ON booking.reference = rates_Booking.bookingReference

                    LEFT JOIN unit ON booking.apartment = unit.unit

                    LEFT JOIN property ON property.property = unit.property

                    # unit to apartments
                    LEFT JOIN apartments ON (apartments.unit = unit.unit)
                    LEFT JOIN apartmentTypes ON (apartmentTypes.id = apartments.apartmentTypeId)

                WHERE
                    rates_Booking.date BETWEEN @startDate AND @endDate
                    AND unit.unit = 221



                GROUP BY
                    property.area,
                    property.property,
                    apartmentTypes.id,
                    unit.unit,
                    rates_Booking.date

                ) AS subQuery ON subQuery.date = rates_Calendar.date


 WHERE
     rates_Calendar.date BETWEEN @startDate AND @endDate
 GROUP BY 
subQuery.reference,
subQuery.unit,
subQuery.apartmentTypeId,
subQuery.property,
subQuery.area,
    rates_Calendar.date

Now, obviously this query will result in NULLS for dates that do not match.
Is there a way to update all the NULLS with the NON NULL values?

2013-01-01  unitA 138 1      property1
2013-01-02  unitA 138 1      property1
2013-01-03  unitA 138 1      property1
2013-01-04  NULL  0   NULL   NULL
2013-01-05  NULL  0   NULL   NULL

Is there a way to update the NULLs with the NON NULLS in the respective columns ?

I’m trying for this because hiding rowGroups with NULLS is not possible as can be understood from the link:
Hide NULL Row Groups JasperReports

Answer 1

I think you don’t want a LEFT JOIN then with your subQuery. Try this:

SELECT

    rates_Calendar.date,
    subQuery.name,
    COALESCE(subQuery.amount,0) as amount,
    subQuery.reference,
    subQuery.property


FROM
    rates_Calendar, (
                SELECT
                    rates_Booking.date,
                    unit.unit,
                    unit.abbreviation as name,
                    rates_Booking.amount,
                    rates_Booking.bookingReference AS reference,
                    property.property


                FROM
                    rates_Booking

                    LEFT JOIN booking ON booking.reference = rates_Booking.bookingReference

                    LEFT JOIN unit ON booking.apartment = unit.unit

                    LEFT JOIN property ON property.property = unit.property

                    # unit to apartments
                    LEFT JOIN apartments ON (apartments.unit = unit.unit)
                    LEFT JOIN apartmentTypes ON (apartmentTypes.id = apartments.apartmentTypeId)

                WHERE
                    rates_Booking.date BETWEEN @startDate AND @endDate
                    AND unit.unit = 221



                GROUP BY
                    property.area,
                    property.property,
                    apartmentTypes.id,
                    unit.unit,
                    rates_Booking.date

                ) AS subQuery


 WHERE
   rates_Calendar.date BETWEEN @startDate AND @endDate