Question

GROUP BY multiple columns and HAVING max value

Asked by: amitbhavsar

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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Asked On
2005-10-24 at 03:54:20ID21605243
Tags

max

,

having

,

group

,

multiple

,

columns

Topic

Databases Miscellaneous

Participating Experts
4
Points
200
Comments
15

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Answers

 

Expert Comment

by: angelIIIPosted on 2005-10-24 at 04:01:50ID: 15145454

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Author Comment

by: amitbhavsarPosted on 2005-10-24 at 04:11:30ID: 15145510

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Author Comment

by: amitbhavsarPosted on 2005-10-24 at 06:07:42ID: 15146149

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Expert Comment

by: ram_0218Posted on 2005-10-24 at 07:03:53ID: 15146597

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Expert Comment

by: jrb1Posted on 2005-10-24 at 07:31:26ID: 15146836

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Author Comment

by: amitbhavsarPosted on 2005-10-24 at 07:33:16ID: 15146848

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by: ram_0218Posted on 2005-10-24 at 07:35:40ID: 15146867

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by: NickUpsonPosted on 2005-10-24 at 07:41:48ID: 15146908

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by: ram_0218Posted on 2005-10-24 at 07:43:27ID: 15146924

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by: jrb1Posted on 2005-10-24 at 10:30:27ID: 15148283

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Accepted Solution

by: jrb1Posted on 2005-10-24 at 10:32:49ID: 15148302

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Expert Comment

by: NickUpsonPosted on 2005-10-24 at 11:32:32ID: 15148692

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