SQL variable restriction

I'm creating a stored proc with a variable @AsOfDate as date. Now, I only want to accept the input date if it is within 3 days of today, otherwise it should not accept it and throw an error. Currently I'm doing this with a IF/ELSE statement. Is there a better way of handling this?

I'm using SQL 2012
timberadminAsked:
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Jim HornMicrosoft SQL Server Developer, Architect, and AuthorCommented:
Something like...
CREATE PROC your_proc (@AsOfDate date) AS

IF ABS(DATEDIFF(day,@AsOfDate, CAST(GETDATE() as date)))  > 3  
   begin
   SELECT 'error'
   end 
ELSE
   begin
   SELECT 'your proc goes here'
   end

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timberadminAuthor Commented:
So that's exactly how I'm doing it right now. I assume this is the correct and most efficient way of handling it?
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Jim HornMicrosoft SQL Server Developer, Architect, and AuthorCommented:
I'm sure there are other ways, but this is the way I'd do it.

btw Did you really want to throw an error, which would involve RAISEERROR, or just handle it?
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timberadminAuthor Commented:
If this stored proc is run from Excel VBA, I want the user to see the error message I give.
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Vitor MontalvãoMSSQL Senior EngineerCommented:
Then I think it's better you raise an SQL Server error. Something like this:

RAISERROR (15999,-1,-1, 'The date difference is higher than 3 days');

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