Hi,

Users of an application can retrieve sales between 2 dates that they pick in
the front end (DateFrom & DateTo)

I have sales data that these values will be used to query, the data is
always summarised to the Sunday of each week.

Before my stored procedure attempts to query, it needs to work out the
nearest Sunday for each of the dates. Eg;

DateFrom = 14th December 2005
This date needs to be converted to look 'backwards' for the nearest Sunday.
It needs to find 11th December.

DateTo = 29th December 2005
This needs to be converted forwards to look to the nearest Sunday. It needs
to find 01 Jan 2006.

Is there any TSQL that can be used to work this out, or is it a case of
using a lookup table (which I do have available)


Thanks
Dylan

Hi
DECLARE @Today datetime
SET @Today = '20060105'

SELECT DATEADD(day, DATEDIFF(day, '1900', @Today)/7*7+6 , '1900')




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Excellent, thanks Uri.

And to convert backwards, I thinks it's just as follows...?? (-1 instead of
+6)

SELECT DATEADD(day, DATEDIFF(day, '1900', @Today)/7*7-1 , '1900')

Thanks again.

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This rounds it up to the nearest Sunday. It prints DateTo, the day or the
week dateto is, and then the rounded up date, and the day of the week the
rounded up day is.

I suspect you can use the modulus operator to make this perform better, but
I'm not SK.

create table salesData
(pk int not null identity primary key,
DateTo datetime,
DateFrom Datetime)
GO
insert into salesData values (getdate()-101,getdate()-103)
insert into salesData values (getdate()-105,getdate()-108)
GO
select  case when  DATENAME ( dw , DateTo )='Sunday' then dateto
when  DATENAME ( dw , DateTo )='Monday' then dateto-1
when  DATENAME ( dw , DateTo )='Tuesday' then dateto-2
when  DATENAME ( dw , DateTo )='Wednesday' then dateto-3
when  DATENAME ( dw , DateTo )='Thursday' then dateto-4
when  DATENAME ( dw , DateTo )='Friday' then dateto-5
when  DATENAME ( dw , DateTo )='Saturday' then dateto-6
end,
dateto, datename(weekday,dateto),
case when  DATENAME ( dw , DateTo )='Sunday' then datename(weekday, dateto)
when  DATENAME ( dw , DateTo )='Monday' then datename(weekday, dateto-1)
when  DATENAME ( dw , DateTo )='Tuesday' then datename(weekday, dateto-2)
when  DATENAME ( dw , DateTo )='Wednesday' then datename(weekday, dateto-3)
when  DATENAME ( dw , DateTo )='Thursday' then datename(weekday, dateto-4)
when  DATENAME ( dw , DateTo )='Friday' then datename(weekday, dateto-5)
when  DATENAME ( dw , DateTo )='Saturday' then datename(weekday, dateto-6)
end
from salesdata
go
drop table salesdata
go

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To do it in one shot, try this:

SELECT DATEADD(day, DATEDIFF(day, '18991231', @Today+3)/7*7 , '18991231')

It will find "next" Sunday, if today is Thursday, Friday, or Saturday,
it will find "This"
Sunday if today is Sunday, and it will find "last" Sunday if today is
Monday, Tuesday, or Wednesday.

Steve Kass
Drew Unviersity

DylanM wrote:

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