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8.4

GROUP BY multiple columns and HAVING max value

Asked by amitbhavsar in Databases Miscellaneous

Tags: max, having, group, multiple, columns

Hi experts,

Can you please look into following query :

SELECT
      BA.*
FROM
      tblBookingAction BA INNER JOIN tblBookingTask BT ON BA.BookingTaskID = BT.bookingTaskID
                   INNER JOIN tblBooking B ON BT.BookingID = B.BookingID
                        INNER JOIN tblBookingTaskType BTT ON BTT.BookingTaskTypeID = BT.BookingTaskTypeID
WHERE
      BA.dateDone IS NULL
      AND B.BookingNo > 0
      AND username = 202588

GROUP BY
      BT.bookingID , priority , BTT.bookingTaskTypeId
HAVING
      priority = (SELECT max(priority) FROM tblBookingTaskType WHERE bookingTaskTypeID = BTT.bookingTaskTypeId)

This returns me rows like follwoing if I just select two columns :
BookingID Priority
1 1
1 2

What I need is just one row per booking i.e. follwing one row : (BookingID with max priority)

BookingID Priority
1 2

In Addition, I want all the columns from tblBookingAction.

How can I do that ?

I might need to group by all the columns of tblbookingAction as I need all of them.

Thanks in advance,

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20091021-EE-VQP-81

GROUP BY multiple columns and HAVING max value

Asked by amitbhavsar in Databases Miscellaneous

Tags: max, having, group, multiple, columns

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