Compare Datetime In Stored Procedure

Hi,

Can i compare date = null in stored procedure? Does this work? The syntax works but it never get into my if else statement? The weird thing here is it has been working and just this morning, it stopped. I don't know why? Could you please help? Thanks,


set ANSI_NULLS ON

set QUOTED_IDENTIFIER ON

go











ALTER PROCEDURE [dbo].[UpdateActiveStates1]

@PROVIDERID INT

AS

DECLARE @STARTDATE DATETIME

DECLARE @ENDDATE DATETIME

DECLARE @ACTIVE BIT

SET @ACTIVE = 0

SET @STARTDATE = (SELECT ProhibitionStartDate FROM Providers WHERE ProviderID=@PROVIDERID)

SET @ENDDATE = (SELECT ProhibitionEndDate FROM Providers WHERE ProviderID=@PROVIDERID)

IF ((@STARTDATE = NULL OR @STARTDATE = '1753-01-01') AND (@ENDDATE = NULL OR @ENDDATE = '1753-01-01'))

BEGIN

PRINT 'Setting Inactive due to NULL Start Date and NULL End Date'

SET @ACTIVE=0

END

ELSE IF (@STARTDATE != NULL AND @STARTDATE <= GETDATE())

BEGIN

IF (@ENDDATE = NULL)

BEGIN

PRINT 'Setting Active due to NON-NULL Start Date and NULL End Date'

SET @ACTIVE=1

END

ELSE IF (@ENDDATE >= GETDATE())

BEGIN

PRINT 'Setting Active due to NON-NULL Start Date and NON-EXPIRED End Date'

SET @ACTIVE=1

END

ELSE

BEGIN

PRINT 'Setting Inactive due to NON-NULL Start Date and EXPIRED End Date'

SET @ACTIVE=0

END

END

UPDATE Providers SET Active=@ACTIVE

WHERE ProviderID=@PROVIDERID

UPDATE Actions SET Active=@ACTIVE WHERE ProviderID=@PROVIDERID