SubQuery Calculations

Question

User1122680954 posted

I really wanted to try to figure this out on my own, but I figured I better give up and ask you guys before I smash my keyboard.

What I'm trying to do is to get a subquery to perform a calculation, and then sum the result.   I have a Table of Shells, and then a table of Lines which are attached to those shells.  I need it to multiply two columns from the lines table, and then add another column, and then sum the results together for a total per shell. For Example.

Shells table:

CompNum, Customer

5024, Customer1

5025, Customer2

Lines table:

CompNum,Line, RejQty, RejPrice, ExtraCosts

5024,1,50,1.24,50

5024,2,20,2.56,200

5025,1,350,2.34,0

5025,2,120,5.90,0

The Calculation should be (RejQty * RejPrice) + ExtraCosts  and then that result should be summed to get a total for each Shell.

And I want the Query to give me the following:  The Calculation for 5024 being ---  ( ((50*1.24) + 50)=112 "Line-1" )  +   ( (20*2.56)+200)=251.2  "Line-2" ) =  363.20

5024,Customer1,363.20

5025,Customer2,1527




I am doing all of this in the SqlDataSource in the Asp.net page.  Here is my latest version out of about 50 or so (which obviously doesn't work).  I've tried making it a subquery, i've tried making it a Join, and I just can't get it.  I can get it to SUM each of those columns individually, but I can't get it to do the calculation and then SUM them.

SELECT [CompNum]=Shell.[CompNum], Shell.[Customer], Shell.[CSR],
            ((SELECT SUM(Line.[ExtraCosts]) + (Line.[RejQty] * Line.[RejUnitPrice])) AS Amount FROM [Lines] WHERE Line.[CompNum] = Shell.[CompNum]) FROM [Shells] AS Shell GROUP BY Shell.[CompNum], Shell.[Customer],"

EDIT: Removed some of the non-relevant columns in the query.

Answer 1

User-933407369 posted

hi lewis886,

I would suggest you try the workaround below:

  select Shell.[CompNum],Shell.[Customer],sum(Amount) Amount from
			  (
			  SELECT 	[CompNum],		
			(Line.[ExtraCosts]) + (Line.[RejQty] * Line.RejPrice)
					  AS Amount FROM  [Lines] as Line
			 ) m, [dbo].[Shells] AS Shell 
			 where m.CompNum=Shell.CompNum
			 group by Shell.[CompNum],Shell.[Customer]

i hope it helps you.

 

Answer 2

User1122680954 posted

Thanks.  I had been working on that for a couple days and it was driving me nuts.  I really appreciate you helping me out.  I just had to add the ISNULL function on the ExtraCosts field (since that field doesn't always have data) and it worked perfectly.  Thanks again