[dba-SQLServer] Calculated Column Field in a table...

Hi Stuart;

Most Excellent.  I will definately take this approach then and forget about using the table.  I am glad, because it was starting to make a lot of sense to me to do the calc outside of the table structure.  Too often I see a problem and I think about it with my MS Excel hat on first, often later in database land I go "oh.. hang on...."

Many thanks for clarifying this for me.

Cheers
Darryl.

-----Original Message-----
From: dba-sqlserver-bounces at databaseadvisors.com
[mailto:dba-sqlserver-bounces at databaseadvisors.com]On Behalf Of Stuart
McLachlan
Sent: Monday, 14 July 2008 4:36 PM
To: Discussion concerning MS SQL Server
Subject: Re: [dba-SQLServer] Calculated Column Field in a table...


Your last comment is right on the nail. You don't want to store calcuated results in the table
unless you have VERY good reasons to do so.

You can create either a View or a Stored Procedure to return Capex and Opex.

In a Stored Procedure it would be

Select
.....,
Case AccTreatmentId
        When 1 Then Dollars*AccountingSplit
        Else Dollars * (1-AccountingSplit)
End As Capex,
Case AccTreatmentId
        When 2 Then Dollars*AccountingSplit
        Else  Dollars * (1-AccountingSplit)
End As Opex,
.....


In the Design grid in a View, put

"CASE AccTreatmentId WHEN 1 THEN Dollars * AccountingSplit ELSE Dollars * (1 -
AccountingSplit) END"
as the Column value and "Capex" as the Alias and similarly for Opex.


Cheers,
Stuart


On 14 Jul 2008 at 15:16, Darryl Collins wrote:

>
> Hi there,
>
> I would have thought this was pretty simple, but I have a great ability to complicate these things it seems - heh, early days for me SQL server.
> I have three fields in the table that I want to use for a calculated result in a couple of other fields in the table.
>
> "AccTreatmentID"
> 1: Opex
> 2: Capex
>
> "AccountingSplit"
> 0%-100%
>
> "Dollars"
> Manually entered dollar value
>
>
> Then I have two other fields (Capex and Opex) and I (think I) want to do this.
>
> "=iif([AccTreamtentID]=1,([Dollars]*[AccountingSplit]),0)" to get the Opex Value
> "=iif([AccTreamtentID]=2,([Dollars]*[AccountingSplit]),0)" to get the Capex Value
>
> or If AccTreatment is Capex, then get the Capex Percentage and multiply by the dollar value to get the capex amount.
> The actual formula is more complex as I need to determine the balance of the percentage and then apply that to the remainder of the value (opex in this case). anyway I am trying to keep it simple to start with.  (plus I will probably need some sort of error test to return zero if part of the data is missing - Am not sure if I need this or not in SQL server.)
>
> The syntax in these formulae are not valid so I would like some help with that.  And I guess my other question is do I actually need this at all?
>
> Maybe I should do all the hack work in a query to report of Opex / Capex splits.  Part of me suspect I dont need to store the calculated data at all in the table at all and this is bad practise as it takes up time and space for no real reason.
>
> Anyone got any thoughts on this.
>
> Cheers
> Darryll
>
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