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MS Access Query: Multiply two fields

Posted on 2004-08-12
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Last Modified: 2008-02-01
I have a DB  in MS Access:

Fields:
Batch - Text
Amount - Currency
Percent - Number
Sold - Yes/No


Batch        Amount         Percent       Global
---------------------------------------------------
A5774B    4556.25          90              Yes
C55647    4435.85          85              No
A5774B    5456.55          100            Yes

-------------------------------------------------------------------------------------

I want to make a query that will output the (Amount * Percent/100)
If it is global it will be in the global fiel else in the sub field

viz.

Batch        Global             Sub
---------------------------------------
A5774B    4100.63        
C55647                          3785.77
A5774B    5456.55

solution could can be in sql as well!
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Question by:rishabhpatel
7 Comments
 
LVL 17

Expert Comment

by:BillAn1
ID: 11782066
Try this :

SELECT Batch, Amount*Percent/100 as Global, NULL as Sub
FROM MyTable
WHERE Global = 'Yes'
UNION
SELECT Batch, NULL as Global, Amount*Percent/100 as Sub
FROM MyTable
WHERE Global = 'No'
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Author Comment

by:rishabhpatel
ID: 11782092
That will get too long for a large query... I want to use a solution with an if statement
0
 
LVL 17

Accepted Solution

by:
BillAn1 earned 250 total points
ID: 11782123
SELECT Batch, iif(Global = 'Yes',Amount*Percent/100,NULL) as Global2, iif(Global = 'No',Amount*Percent/100,NULL) as Sub2
FROM MyTable
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LVL 1

Expert Comment

by:amulya_333
ID: 11790623
Is it ok if I write a small prodedure?

Amulya.
0
 
LVL 17

Expert Comment

by:BillAn1
ID: 11790946
I'm not sure what a procedure would benefit - it would basically contain the same SQL. If you split the query, you are going to re-create either the union approach, or the iif approach, which will do the same thing, but be less efficient?
0
 
LVL 1

Expert Comment

by:anupbhunia
ID: 11792739
I don't think it would enhance the performance if you create a procedure and compile it, as the query is without greate complexity.

First and second both soulusion are correct, I would prefer IIF() one.

Best of luck
0
 
LVL 17

Expert Comment

by:BillAn1
ID: 11792841
I suspect the union method will be quicker particularly if there is an index on the 'Global' field, as the IIF has to evaluate 2 function calls per row, as opposed to dividing the table in 2 via an index search.
As for performance of procedure - the time here will be in the actual calc, not the compilation etc so there is no benefit in that regard.
If performance becomes an issue it is indexing that will solve it.

Can you explain the term
"That will get too long for a large query... "

long queries are only a problem for programmers, and if it is A union B you just copy/paste the two halves. The database won't mind a long text string.
0

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