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Sum 2 Columns Subtract 2 Columns If Statement?

Posted on 2011-02-28
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Last Modified: 2012-05-11
I would like to use the results "dif" to build If Statement. Unsure how to include ">= 0" into following code.
Could need Case statement?

[English]
If sum(col1) - sum(col2 >= 0 Then continue with other code, Else don't continue

if Exists (
Select Sum(Col1) - Sum(Col2) As [diff]
 From Products
 Where SalesMan = 'sales@mycompany.com'
 And ProductName = 'Laptop'
 Group By Col1, Col2
 )
--...continue with more code...


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Comment
Question by:pointeman
5 Comments
 
LVL 28

Expert Comment

by:strickdd
ID: 35000797
IF (SUM(col1) - SUM(col2)) >= 0
BEGIN
   --Stuff to do here.
END
0
 
LVL 9

Accepted Solution

by:
joshbula earned 167 total points
ID: 35000815
Do the calculation in the WHERE statement:

Select * FROM Products
WHERE Sum(Col1) - Sum(Col2) >= 0 AND SalesMan = ....etc...
0
 
LVL 8

Assisted Solution

by:WesWilson
WesWilson earned 166 total points
ID: 35000857
IF (SELECT Sum(Col1) - Sum(Col2)
 FROM Products
 Where SalesMan = 'sales@mycompany.com'
 And ProductName = 'Laptop') >= 0
--do whatever
SELECT 1
ELSE
SELECT 2
0
 
LVL 19

Assisted Solution

by:billmercer
billmercer earned 167 total points
ID: 35000913
This: sum(col1) - sum(col2 )>= 0  is comparing two values and returning true or false based on which is bigger.
However this: if Exists ( Select Sum(Col1) - Sum(Col2) As [diff]...etc )
is checking to see if a record was returned, regardless of what the values are.

If you want to know if there are any records that match this criterion, wouldn't a where be more appropriate?

if exists ( Select *  From Products  Where SalesMan = 'sales@mycompany.com'
 And ProductName = 'Laptop'
and sum(col1) >= sum(Col2)
 Group By Col1, Col2 )

As an aside, if your goal is to only do something to records that have a certain value for diff, it would probably be more efficient to build a query that does what you need rather than using a cursor to move through records and test each one.  
 
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Author Closing Comment

by:pointeman
ID: 35001301
ya, Where statement
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