February 27, 2009 at 12:51 pm
Hi,
why i can't use the first variable in the dateadd(the second variable works good)?
declare @TypeOfClean nvarchar (10),@CleanNumber smallint
set @TypeOfClean = 'dd'
set @CleanNumber = 2
select dateadd (@TypeOfClean,-@CleanNumber,getdate())
--the Error = Invalid parameter 1 specified for dateadd.
THX
February 27, 2009 at 1:01 pm
You can't use a variable to pass in that DATEADD parameter. The only way I know of to do what you're attempting is to use dynamic SQL like this:
DECLARE @TypeOfClean NVARCHAR (10),@CleanNumber SMALLINT, @sql NVARCHAR(MAX)
SET @TypeOfClean = 'dd'
SET @CleanNumber = 2
SET @sql = 'SELECT DATEADD (' + @TypeOfClean + ',-' + CONVERT(NVARCHAR(5), @CleanNumber) + ',GETDATE())'
EXECUTE sp_executesql @sql
Greg
February 27, 2009 at 1:15 pm
Easier with a case statement. There are only so many variations on the interval.
case @Type
when 'dd' then dateadd(day, @Number, MyDate)
when 'ww' then dateadd(week, @Number, MyDate)
when 'mm' then dateadd(month, @Number, MyDate)
when 'yy' then dateadd(year, @Number, MyDate)
end
No dynamic SQL needed.
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