Question

Can’t understand why I can’t get the correct answer. I’m trying to calculate a net margin percentage but the divide portion is being ignored. Hopefully really simple one?

SUM(
    (dbo.K3_TradeTeam_Sales2.TotalSales - dbo.K3_TradeTeam_SalesReturn3.TotalCredits)
    ISNULL(dbo.K3_TradeTeam_Purch1.TotalPurchases, 0) / 
           dbo.K3_TradeTeam_Sales2.TotalSales
   ) AS NetMargin

Answer 1

To get a net margin you probably want an expression like this,

(
    SUM(
            dbo.K3_TradeTeam_Sales2.TotalSales
        - 
            COALESCE(dbo.K3_TradeTeam_SalesReturn3.TotalCredits, 0.0)
        -
            COALESCE(dbo.K3_TradeTeam_Purch1.TotalPurchases, 0.0)
       )
/ 
    SUM(
            dbo.K3_TradeTeam_Sales2.TotalSales
       )
) AS NetMargin

However, without knowing your schema I couldn’t say for sure. This would also fail miserable when you have 0.0 total sales.

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I’m assuming that your want the sum of net profits for each realtion divided by the sum of the total revenue for each relation. This would give you the cumulative profit margin for all relationships.