problem with functions and datetime parameters!

Hi all.
i've written a portion of sql code with a dtetime parameter that run very
very fast on a sql window, but when i create a function with the same code
the execution time is extremely long!
to recreate the same speed i found that i must declare a local variable
inside the scope of the function and then assign the variable passed to the
function.
does anyone had the same problem? there is a solution to this bug?
this is my code...
regards,
stefano
create function kp.getQuotaHWM (@.dd1 datetime)
returns float
as
begin
declare @.dd datetime
set @.dd = @.dd1
return (
... code of the function
)
endOn Mon, 8 Aug 2005 11:09:41 +0200, stefano wrote:

>Hi all.
>i've written a portion of sql code with a dtetime parameter that run very
>very fast on a sql window, but when i create a function with the same code
>the execution time is extremely long!
>to recreate the same speed i found that i must declare a local variable
>inside the scope of the function and then assign the variable passed to the
>function.
>does anyone had the same problem? there is a solution to this bug?
Hi stefano,
This is a known issue. Not exactly a bug - more an unwanted side effect
of a wanted feature.
Search this group (or the internet) for "parameter sniffing" to find
alll the details.
Best, Hugo
--
(Remove _NO_ and _SPAM_ to get my e-mail address)|||Hi Hugo.
many thanks for your informations.
regards, stefano
"Hugo Kornelis" <hugo@.pe_NO_rFact.in_SPAM_fo> wrote in message
news:q5iff1pndv10nhhr32c650b9vb5evi0fkb@.
4ax.com...
> On Mon, 8 Aug 2005 11:09:41 +0200, stefano wrote:
>
> Hi stefano,
> This is a known issue. Not exactly a bug - more an unwanted side effect
> of a wanted feature.
> Search this group (or the internet) for "parameter sniffing" to find
> alll the details.
> Best, Hugo
> --
> (Remove _NO_ and _SPAM_ to get my e-mail address)

Problem with expression window in derived column

Hi,

i am facing problem to dervie one column value from another column using either if and case statements in expression window of dervived columns transformation.

let me give the exapmle. i get 1 column from source system name as "col a" and i want to insert 2 columns into my destination as col A and col B. based on the values of col A i want to derive the values of col B,like if col A value is 0 then col B value is Good else BAD.

Can any one asssit in this regard how to achive it? and is it possible to use IF and CASE statement in this dervived column tranformation?

Sreenivas

Select the Add New column option, call it ColB or whatever, then use an expression like this -

ColA == 0 ? "GOOD" : "BAD"

This uses the conditional operator, as documented in Books Online - http://msdn2.microsoft.com/en-us/library/d38e6890-7338-4ce0-a837-2dbb41823a37(SQL.90).aspx

Logicaly it reads like this -

If ColA Equals 0 Then

Return "GOOD"

Else

Return "BAD"

End If