COUNT and compare

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COUNT and compare

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support 86837

Posted Tuesday, December 18, 2012 3:45 PM

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For some reason I've always gotten confuses when using COUNT!

I have two tables, one for Orders and then an Assiged Parcels table which can have multiple records attached to an Order. In the Order table is column Pieces, which must match the count for Assigned Parcels. I also need to make the Orders table 'clickable' in the results.

Here is my code. What am I doing wrong?

SELECT PA.OrderID, COUNT(PA.OrderID) AS 'TotalParcels'
FROM tblParcelAssigned as PA
INNER JOIN tblOrder AS O ON O.OrderID = PA.OrderID
WHERE PA.Type = 2
AND O.Pieces <> TotalParcels
GROUP BY PA.OrderID
ORDER BY PA.OrderID DESC

Thanks from Newbie Dan!

Post #1398081

Evil Kraig F

Posted Tuesday, December 18, 2012 4:15 PM

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support 86837 (12/18/2012)

I have two tables, one for Orders and then an Assiged Parcels table which can have multiple records attached to an Order. In the Order table is column Pieces, which must match the count for Assigned Parcels.
Here is my code. What am I doing wrong?

It's an Order of Evaluation issue. You use the WHERE clause to filter what goes into the aggregation, then you use the HAVING clause to filter the results of the aggregation, like so:

SELECT 
	PA.OrderID, 
	COUNT(*) AS 'TotalParcels'
FROM 
	tblParcelAssigned as PA
	INNER JOIN  
		tblOrder AS O 
	ON	O.OrderID = PA.OrderID
WHERE 
	PA.Type = 2
HAVING
	o.Pieces <> Count(*)
GROUP BY 
	PA.OrderID
ORDER BY 
	PA.OrderID 
DESC

I also need to make the Orders table 'clickable' in the results.

I'm not entirely sure what you mean by this.

- Craig Farrell

Never stop learning, even if it hurts. Ego bruises are practically mandatory as you learn unless you've never risked enough to make a mistake.

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Post #1398090

support 86837

Posted Tuesday, December 18, 2012 4:28 PM

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Your query works only if I omit the HAVING clause.

Post #1398099

Evil Kraig F

Posted Tuesday, December 18, 2012 4:56 PM

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support 86837 (12/18/2012)

Your query works only if I omit the HAVING clause.

What error are you getting? You're getting untested code as I don't have a sample set to work from for your particular issue. If you check the first link in my signature, you'll see how we usually ask for code assistance requests like this to be setup so we can get you tested code.

Post #1398106

dwain.c

Posted Tuesday, December 18, 2012 9:13 PM

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Evil Kraig F (12/18/2012)

support 86837 (12/18/2012)

It's an Order of Evaluation issue. You use the WHERE clause to filter what goes into the aggregation, then you use the HAVING clause to filter the results of the aggregation, like so:

SELECT 
	PA.OrderID, 
	COUNT(*) AS 'TotalParcels'
FROM 
	tblParcelAssigned as PA
	INNER JOIN  
		tblOrder AS O 
	ON	O.OrderID = PA.OrderID
WHERE 
	PA.Type = 2
HAVING
	o.Pieces <> Count(*)
GROUP BY 
	PA.OrderID
ORDER BY 
	PA.OrderID 
DESC

I also need to make the Orders table 'clickable' in the results.

I'm not entirely sure what you mean by this.

I think the problem may be that HAVING needs to be after GROUP BY.

No loops! No CURSORs! No RBAR! Hoo-uh!

INDEXing a poor-performing query is like putting sugar on cat food. Yeah, it probably tastes better but are you sure you want to eat it?

Need to UNPIVOT? Why not CROSS APPLY VALUES instead?
Since random numbers are too important to be left to chance, let's generate some!
Are you too recursively challenged?
Splitting strings based on patterns can be fast!

Post #1398132

support 86837

Posted Wednesday, December 19, 2012 10:18 AM

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Last Login: Thursday, December 20, 2012 7:40 AM
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That doesn't seem to work either. After dropping and adding lines to the code, it seems that the comparison line is where it hiccups.

Here is an example where I get the columns to display side by side. Still, the HAVING is where I don't yet have it. If I omit the HAVING, the query runs fine.

SELECT
O.OrderID,
O.Pieces,
PA.OrderID,
COUNT(PA.OrderID) AS TotalParcels,
COUNT(*) AS 'TotalParcels'
FROM
tblParcelAssigned as PA
INNER JOIN
tblOrder AS O
ON O.OrderID = PA.OrderID
WHERE
PA.Type = 2
-- HAVING
-- o.Pieces <> Count(*)
GROUP BY
O.OrderID,
O.Pieces,
PA.OrderID
ORDER BY
PA.OrderID
DESC

Post #1398534

support 86837

Posted Wednesday, December 19, 2012 10:30 AM

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By the way, the indentations in my code display fine when I edit my post, but the final version has them all lined up without colors or indents. Not sure what I'm doing wrong!

Post #1398544

Evil Kraig F

Posted Wednesday, December 19, 2012 3:18 PM

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Use the code="sql" IfCode on the left, like so. Dwain's right, I flipped the order for having/group by, need to put it after.

SELECT 
	O.OrderID, 
              O.Pieces, 
              PA.OrderID, 
              COUNT(PA.OrderID) AS TotalParcels, 
	COUNT(*) AS 'TotalParcels'
FROM 
	tblParcelAssigned as PA
	INNER JOIN  
		tblOrder AS O 
	ON	O.OrderID = PA.OrderID
WHERE 
	PA.Type = 2
GROUP BY 
              O.OrderID,
              O.Pieces,
	PA.OrderID
HAVING
	o.Pieces <> Count(*)
ORDER BY 
	PA.OrderID 
DESC

Post #1398690

support 86837

Posted Thursday, December 20, 2012 7:42 AM

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Thank you everyone for your help. I'm sure I'll get better at this the more I practice. I've referred those who've offered me accoldes to this thread.

Dan

Post #1398976

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