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join 2 tables without duplicate rows


join 2 tables without duplicate rows

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mattech06
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Having a bit of a brain freeze at the moment!

I wish to extract data from 2 tables which are linked by dbPatID but don't want duplicate rows created when there is more than one occurrence of dbPatID in table 2 which is what this sql is bringing back.


Select EPSAgedBalances.dbPatID, EPSAgedBalances.dbPatFirstName, EPSAgedBalances.dbPatLastName,
EPSAllContracts.dbStaffLastName, EPSAgedBalances.TotTot
from EPSAgedBalances
inner join EPSAllContracts on EPSAllContracts.dbPatID = EPSAgedBalances.dbPatID
where EPSAgedBalances.TotTot < 0


In other words I'm just after the dbStaffLastName from table 2 that matches up with dbPatID.

thanks
Abu Dina
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Happy new year! :-D

So one contract can have multiple aged balances?

How about the below:

Select b.dbPatID, a.dbPatFirstName, a.dbPatLastName, b.dbStaffLastName, SUM(a.TotTot) AS TotTot
from EPSAgedBalances AS a
inner join EPSAllContracts AS b
on b.dbPatID = a.dbPatID
GROUP BY b.dbPatID, a.dbPatFirstName, a.dbPatLastName, b.dbStaffLastName
HAVING SUM(a.TotTot) < 0



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Here's an alternative to Abu Dinas' suggestion;
SELECT 
b.dbPatID,
b.dbPatFirstName,
b.dbPatLastName,
x.dbStaffLastName,
b.TotTot
FROM EPSAgedBalances b
CROSS APPLY (
SELECT TOP 1 dbStaffLastName
FROM EPSAllContracts c
WHERE c.dbPatID = b.dbPatID
) x
WHERE b.TotTot < 0



Not necessarily better - you should try both and compare performance.

“Write the query the simplest way. If through testing it becomes clear that the performance is inadequate, consider alternative query forms.” - Gail Shaw

For fast, accurate and documented assistance in answering your questions, please read this article.
Understanding and using APPLY, (I) and (II) Paul White
Hidden RBAR: Triangular Joins / The "Numbers" or "Tally" Table: What it is and how it replaces a loop Jeff Moden
Exploring Recursive CTEs by Example Dwain Camps
mattech06
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Hi Guys, thanks for your help. I found simply adding distinct has done the trick


Select distinct EPSAgedBalances.dbPatID, EPSAgedBalances.dbPatFirstName, EPSAgedBalances.dbPatLastName,
EPSAllContracts.dbStaffLastName, EPSAgedBalances.TotTot
from EPSAgedBalances, EPSAllContracts
where EPSAllContracts.dbPatID = EPSAgedBalances.dbPatID
and TotTot < 0


thanks
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