Trying to limit the fidelity (to 2 decimal places) of a calculated value?

Question

Hi Everyone,
I have a column that shows the Profit / Loss % for items sold.
ISNULL(((T0.LineTotal - T0.StockValue) / NULLIF(T0.StockValue, 0)) * 100, 0
Because it is possible for StockValue to be a zero (0) amount in our system it was necessary to add the NULLIF function.
If a NULL value is detected then a value of 0 is ultimately returned. Due to the fact that there could still be a profit or a loss in this column I needed to add 'N/A', which I achieved by casting the calculation to a varchar and then applying a CASE statement, the full syntax is as follows -
CAST(ISNULL(((T0.LineTotal - T0.StockValue) / NULLIF(T0.StockValue, 0)) * 100, 0) AS varchar) = '0.00000000000000' THEN 'N/A'
ELSE CAST(ISNULL(((T0.LineTotal - T0.StockValue) / NULLIF(T0.StockValue, 0)) * 100, 0) AS varchar) END
AS 'Profit / Loss %'
My challenge is that the % for profit has an excessive level of fidelity, it currently goes to 14 decimal places (e.g.: 134.43223443223443)!
I would like to limit the fidelity to 2 decimal places (e.g: 134.43). I have attempted to do this by 'double casting', first casting to a decimal then to a varchar (to allow for the 'N/A') -
CAST(CAST(ISNULL(((T0.LineTotal - T0.StockValue) / NULLIF(T0.StockValue, 0)) * 100, 0) AS decimal) AS varchar)
In this case the fidelity is not sufficient, and I lose all decimal places. If I stipulate the nature of the decimal place, e.g.: decimal(4,2), then I get an "arithmetic overflow" error.
How can I make my results either 'N/A' or a numeric result (with 2 decimal places)?
Any help will be greatly appreciated.
Kind Regards,
David

Answer 1

Hi David...
Check this
*    Purpose: Lists the Sales History of Items by (user designated): 
*    Item Code (range) and / or    
*    Whs Code (range) and / or 
*    Industry Code and / or    
*    BP (Customer Code) 
DECLARE @begItemCode nvarchar(20), @endItemCode nvarchar(20), @whsCode nvarchar(5), @indCode nvarchar(5), @custNo nvarchar(10) 
SET @begItemCode = '' 
    IF @begItemCode = '' 
        SET @begItemCode = '00%' 
SET @endItemCode = '' + 'Z' 
    IF @endItemCode = 'Z' 
        SET @endItemCode = 'ZZ%' 
SET @whsCode = '' 
    IF @whsCode = '' 
        SET @whsCode = '%' 
SET @indCode = '' 
    IF @indCode = '' 
        SET @indCode = '%' 
SET @custNo = 'C000002' 
    IF @custNo = '' 
        SET @custNo = '%' 
        select tt.[Document Date],tt.[Document No.],tt.[Doc Type],tt.[Cust Code],tt.[Customer Name],tt.[Item Code],tt.[Item Description] ,
        tt.whscode, tt.[Line Net],tt.[Line Cost],tt.[Itm Avg Cost] , tt.[Profit / Loss],
        cast(round(tt.[Profit / Loss %],2,0) as decimal(18,2) ) as 'PL%',tt.[Vendor Name],tt.[Salesman Name] from (
SELECT 
T1.DocDate AS 'Document Date' 
, T1.DocNum AS 'Document No.' 
, 'Invoice' AS 'Doc Type' 
, T1.CardCode AS 'Cust Code' 
, T1.CardName AS 'Customer Name' 
, T0.ItemCode AS 'Item Code' 
, T0.Dscription AS 'Item Description' 
, T0.Quantity AS 'Ship Qty' 
, T0.WhsCode 
, T0.LineTotal AS 'Line Net' 
, T0.StockValue AS 'Line Cost' 
, T2.AvgPrice AS 'Itm Avg Cost' 
, (T0.LineTotal - T0.StockValue) AS 'Profit / Loss' 
, CASE WHEN 
--ROUND(
  CAST(ISNULL(((T0.LineTotal - T0.StockValue) / NULLIF(T0.StockValue, 0)) * 100, 0) AS varchar) = '0.00000000000000' THEN 'N/A' 
  ELSE CAST(ISNULL(((T0.LineTotal - T0.StockValue) / NULLIF(T0.StockValue, 0)) * 100, 0) AS varchar) END    
  AS 'Profit / Loss %' 
, T4.CardName AS 'Vendor Name' 
, T5.SlpName AS 'Salesman Name' 
FROM  dbo.INV1 T0 
INNER JOIN  dbo.OINV T1 ON T1.DocEntry = T0.DocEntry 
INNER JOIN  dbo.OITM T2 ON T2.ItemCode = T0.ItemCode 
INNER JOIN  dbo.ITM1 T3 ON T3.ItemCode = T0.ItemCode AND T3.PriceList = 1 
INNER JOIN  DBO.OCRD T4 ON T4.CardCode = T2.CardCode 
INNER JOIN  DBO.OSLP T5 ON T5.SlpCode = T1.SlpCode 
WHERE T1.DocType = 'I' AND T2.OnHand > 0 AND T0.ItemCode >= @begItemCode AND T0.ItemCode <= @endItemCode AND T0.WhsCode LIKE @whsCode 
AND T2.U_SCE_IN_Industry LIKE @indCode AND T1.CardCode LIKE @custNo 
UNION ALL 
SELECT 
T10.DocDate AS 'Document Date' 
, T10.DocNum AS 'Document No.' 
, 'Credit' AS 'Doc Type' 
, T10.CardCode AS 'Cust Code' 
, T10.CardName AS 'Customer Name' 
, T9.ItemCode AS 'Item Code' 
, T9.Dscription AS 'Item Description' 
, -1 * T9.Quantity AS 'Ship Qty' 
, T9.WhsCode 
, -1 * T9.LineTotal AS 'Line Net' 
, -1 * T9.StockValue AS 'Line Cost' 
, T11.AvgPrice AS 'Itm Avg Cost' 
, -1 * (T9.LineTotal - T9.StockValue) AS 'Profit / Loss' 
, CASE WHEN 
  CAST(ISNULL(((T9.LineTotal - T9.StockValue) / NULLIF(T9.StockValue, 0)) * -100, 0) AS varchar) = '0.00000000000000' THEN 'N/A' 
  --ELSE CAST(CAST(ISNULL(((T9.LineTotal - T9.StockValue) / NULLIF(T9.StockValue, 0)) * -100, 0) AS decimal) AS varchar) END 
  ELSE CAST(ISNULL(((T9.LineTotal - T9.StockValue) / NULLIF(T9.StockValue, 0)) * -100, 0) AS varchar) END 
  AS 'Profit / Loss %' 
, T13.CardName AS 'Vendor Name' 
, T14.SlpName AS 'Salesman Name' 
FROM  dbo.RIN1 T9 
INNER JOIN  dbo.ORIN T10 ON T10.DocEntry = T9.DocEntry 
INNER JOIN  dbo.OITM T11 ON T11.ItemCode = T9.ItemCode 
INNER JOIN  dbo.ITM1 T12 ON T12.ItemCode = T9.ItemCode AND T12.PriceList = 1 
INNER JOIN  DBO.OCRD T13 ON T13.CardCode = T11.CardCode 
INNER JOIN  DBO.OSLP T14 ON T14.SlpCode = T10.SlpCode 
WHERE T10.DocType = 'I' AND T9.ItemCode >= @begItemCode AND T9.ItemCode <= @endItemCode AND T9.WhsCode LIKE @whsCode 
AND T11.U_SCE_IN_Industry LIKE @indCode AND T10.CardCode LIKE @custNo  
  ) as tt
Hope Helpful
Regards
Kennedy