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Home > Forums > Programmers > DBMS Packages > Microsoft SQL Server: Programming Forum

Trying to include a COUNT from another table...Helpful Member! 

thread183-1683104
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Amesville (Programmer)
14 May 12 13:48
Hi Folks

I'm trying to collect data from two tables where I would ordinarily use a left join on the columns that relate the tables. But I'm trying to bring back a count of items from the second table where on the column being used where the table repation would take place. Something like this:

CODE

SELECT COUNT(wb.WaybillID), Tr.TrID, Tr.TrName, CAST(Tr.trMaxCars * (Tr.TrPctThru * 0.01) AS integer) as TrCarLimit, Tr.TrFromStagingArea FROM Train Tr LEFT JOIN Waybill wb ON tr.TrID = wb.TrainAssignment WHERE Tr.TrOriginateOL = 'Y' GROUP BY Tr.TrID
Amesville (Programmer)
14 May 12 13:50
Sorry, somehow that got posted before I was done. Anyway, this statement tells me that Tr.TrID is invalid in the select because it doesn't appear in the GROUP BY Clause. I'm not sure how to fix this, I'm afraid I might have to break this down into a cursor? Can anyone suggest a fix?

Thanks

Craig
Helpful Member!  gmmastros (Programmer)
14 May 12 13:59
There are several ways you can write this query to return the results you are looking for. The following is called a derived table method. Basically, you write a query that returns the minimum data you need, and then you wrap the query in parenthesis and treat it (from the aspect of the outer query) as though it was a separate table. Like this:

CODE

SELECT wb.WaybillCount, Tr.TrID, Tr.TrName, CAST(Tr.trMaxCars * (Tr.TrPctThru * 0.01) AS integer) as TrCarLimit, Tr.TrFromStagingArea FROM Train Tr LEFT JOIN ( Select TrainAssignment, Count(WayBillId) As WayBillCount From WayBill Group By TrainAssignment ) As wb ON tr.TrID = wb.TrainAssignment WHERE Tr.TrOriginateOL = 'Y'

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Amesville (Programmer)
14 May 12 14:06
Thank you George! That did the trick. I will take a good look at it and try to learn something from it... :)
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